# Albert Einstein

Albert Einstein
Einstein in 1947.
Einstein in 1947.
BornTemplate:BirthDeathAge
Ulm, Württemberg, Germany
DiedTemplate:BirthDeathAge
Princeton, New Jersey, USA
ResidenceGermany, Italy, Switzerland, USA
CitizenshipGerman (1879–96, 1914–33)
Swiss (1901–55)
American (1940–55)
EthnicityAshkenazi Jewish
FieldsPhysicist
InstitutionsSwiss Patent Office (Berne)
University of Zurich
Charles University, Prague
Kaiser Wilhelm Institute
University of Leiden
Alma materETH Zurich
University of Zurich
Known forGeneral relativity
Special relativity
Brownian motion
Photoelectric effect
Mass-energy equivalence
Einstein field equations
Unified Field Theory
Bose–Einstein statistics
InfluencesMarcel Grossmann
InfluencedDavid Bohm
Notable awardsNobel Prize in Physics (1921)
Copley Medal (1925)
Max Planck Medal (1929)
Religious stanceSee main text
Signature
Albert Einstein 's signature

Albert Einstein (German: IPA: [ˈalbɐt ˈaɪ̯nʃtaɪ̯n] (Audio file) ; English: IPA: /ˈælbɝt ˈaɪnstaɪn/) (March 14, 1879April 18, 1955) was a German-born theoretical physicist. He is best known for his theory of relativity and specifically mass–energy equivalence, ${\displaystyle E=mc^{2}}$. Einstein received the 1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."[1]

Einstein's many contributions to physics include his special theory of relativity, which reconciled mechanics with electromagnetism, and his general theory of relativity, which extended the principle of relativity to non-uniform motion, creating a new theory of gravitation. His other contributions include relativistic cosmology, capillary action, critical opalescence, classical problems of statistical mechanics and their application to quantum theory, an explanation of the Brownian movement of molecules, atomic transition probabilities, the quantum theory of a monatomic gas, thermal properties of light with low radiation density (which laid the foundation for the photon theory), a theory of radiation including stimulated emission, the conception of a unified field theory, and the geometrization of physics.

Works by Albert Einstein include more than fifty scientific papers and also non-scientific books.[2][3] Einstein is revered by the physics community,[4] and in 1999 Time magazine named him the "Person of the Century". He is probably the most recognized scientist in history, as well as one of the most important, counted among or even surpassing the achievements of Galileo, Isaac Newton, and Charles Darwin. In wider culture the name "Einstein" has become synonymous with genius.

## Youth and schooling

Albert Einstein was born into a Jewish family in Ulm, Württemberg, Germany on March 14, 1879. His father was Hermann Einstein, a salesman and engineer. His mother was Pauline Einstein (née Koch). In 1880, the family moved to Munich, where his father and his uncle founded a company, Elektrotechnische Fabrik J. Einstein & Cie, that manufactured electrical equipment.

The Einsteins were not observant of Jewish religious practices, and Albert attended a Catholic elementary school. Although Einstein had early speech difficulties, he was a top student in elementary school.[5][6]

File:Albert Einstein as a child.jpg
Albert Einstein in 1893 (age 14), taken before the family moved to Italy

When Einstein was five, his father showed him a pocket compass. Einstein realized that something in empty space was moving the needle and later stated that this experience made "a deep and lasting impression".[7] At his mother's insistence, he took violin lessons starting at age six, and although he disliked them and eventually quit, he later took great pleasure in Mozart's violin sonatas. As he grew, Einstein built models and mechanical devices for fun, and began to show a talent for mathematics.

In 1889, family friend Max Talmud, a medical student,[8] introduced the ten-year-old Einstein to key science, mathematics, and philosophy texts, including Kant's Critique of Pure Reason and Euclid's Elements (Einstein called it the "holy little geometry book").[8] From Euclid, Einstein began to understand deductive reasoning, and by the age of twelve, he had learned Euclidean geometry. Soon thereafter he began to investigate calculus.

In his early teens, Einstein attended the progressive Luitpold Gymnasium. His father intended for him to pursue electrical engineering, but Einstein clashed with authorities and resented the school regimen. He later wrote that the spirit of learning and creative thought were lost in strict rote learning.

In 1894, when Einstein was fifteen, his father's business failed, and the Einstein family moved to Italy, first to Milan and then, after a few months, to Pavia. During this time, Einstein wrote his first scientific work, "The Investigation of the State of Aether in Magnetic Fields".[9] Einstein had been left behind in Munich to finish high school, but in the spring of 1895, he withdrew to join his family in Pavia, convincing the school to let him go by using a doctor's note.

Rather than completing high school, Einstein decided to apply directly to the ETH Zurich, the Swiss Federal Institute of Technology in Zürich, Switzerland. Lacking a school certificate, he was required to take an entrance examination, which he did not pass, although he got exceptional marks in mathematics and physics.[10] Einstein wrote that it was in that same year, at age 16, that he first performed his famous thought experiment visualizing traveling alongside a beam of light (Einstein 1979).

The Einsteins sent Albert to Aarau, Switzerland to finish secondary school. While lodging with the family of Professor Jost Winteler, he fell in love with the family's daughter, Marie. (Albert's sister Maja later married Paul Winteler.)[11][12] In Aarau, Einstein studied Maxwell's electromagnetic theory. In 1896, he graduated at age 17, renounced his German citizenship to avoid military service (with his father's approval), and finally enrolled in the mathematics program at ETH. Marie moved to Olsberg, Switzerland for a teaching post.

In 1896, Einstein's future wife, Mileva Marić, also enrolled at ETH, as the only woman studying mathematics. During the next few years, Einstein and Marić's friendship developed into romance. Einstein graduated in 1900 from ETH with a degree in physics.[13] That same year, Einstein's friend Michele Besso introduced him to the work of Ernst Mach. The next year, Einstein published a paper in the prestigious Annalen der Physik on the capillary forces of a straw (Einstein 1901). On February 21, 1901, he gained Swiss citizenship, which he never revoked.[14]

## Patent office

File:Einsteinhaus4.jpg
The 'Einsteinhaus' in Berne where Einstein lived with Mileva on the first floor during his Annus Mirabilis

Following graduation, Einstein could not find a teaching post. After almost two years of searching, a former classmate's father helped him get a job in Berne, at the Federal Office for Intellectual Property,[15] the patent office, as an assistant examiner. His responsibility was evaluating patent applications for electromagnetic devices. In 1903, Einstein's position at the Swiss Patent Office was made permanent, although he was passed over for promotion until he "fully mastered machine technology".[16]

With friends he met in Bern, Einstein formed a weekly discussion club on science and philosophy, jokingly named "The Olympia Academy". Their readings included Poincaré, Mach, and Hume, who influenced Einstein's scientific and philosophical outlook.[17]

During this period Einstein had almost no personal contact with the physics community.[18] Much of his work at the patent office related to questions about transmission of electric signals and electrical-mechanical synchronization of time: two technical problems that show up conspicuously in the thought experiments that eventually led Einstein to his radical conclusions about the nature of light and the fundamental connection between space and time.[16][17]

## Marriage and family life

Einstein and Mileva Marić had a daughter, Lieserl Einstein, born in early 1902.[19] Her fate is unknown.

Einstein married Mileva on January 6, 1903, although Einstein's mother had objected to the match because she had a prejudice against Serbs and thought Marić "too old" and "physically defective."[20] [21] Their relationship was for a time a personal and intellectual partnership. In a letter to her, Einstein called Marić "a creature who is my equal and who is as strong and independent as I am."[22] There has been debate about whether Marić influenced Einstein's work; however, most historians do not think she made major contributions.[23][24][25] On May 14, 1904, Albert and Mileva's first son, Hans Albert Einstein, was born in Berne, Switzerland. Their second son, Eduard, was born in Munich on July 28, 1910.

Einstein and Marić divorced on February 14, 1919, having lived apart for five years. On June 2 of that year, Einstein married Elsa Löwenthal, who had nursed him through an illness. Elsa was Albert's first cousin maternally and his second cousin paternally. Together the Einsteins raised Margot and Ilse, Elsa's daughters from her first marriage.[26] Their union produced no children.

## Annus Mirabilis

File:Einstein patentoffice.jpg
Albert Einstein, 1905

In 1905, while he was working in the patent office, Einstein had four papers published in the Annalen der Physik, the leading German physics journal. These are the papers that history has come to call the Annus Mirabilis Papers:

• His paper on the particulate nature of light put forward the idea that certain experimental results, notably the photoelectric effect, could be simply understood from the postulate that light interacts with matter as discrete "packets" (quanta) of energy, an idea that had been introduced by Max Planck in 1900 as a purely mathematical manipulation, and which seemed to contradict contemporary wave theories of light.(Einstein 1905a) This was the only work of Einstein's that he himself called "revolutionary."
• His paper on Brownian motion explained the random movement of very small objects as direct evidence of molecular action, thus supporting the atomic theory. (Einstein 1905c)
• His paper on the electrodynamics of moving bodies introduced the radical theory of special relativity, which showed that the observed independence of the speed of light on the observer's state of motion required fundamental changes to the notion of simultaneity. Consequences of this include the time-space frame of a moving body slowing down and contracting (in the direction of motion) relative to the frame of the observer. This paper also argued that the idea of a luminiferous aether—one of the leading theoretical entities in physics at the time—was superfluous. (Einstein 1905d)
• In his paper on mass–energy equivalence (previously considered to be distinct concepts), Einstein deduced from his equations of special relativity what later became the well-known expression: ${\displaystyle E=mc^{2}}$, suggesting that tiny amounts of mass could be converted into huge amounts of energy. (Einstein 1905e)

All four papers are today recognized as tremendous achievements—and hence 1905 is known as Einstein's "Wonderful Year". At the time, however, they were not noticed by most physicists as being important, and many of those who did notice them rejected them outright. Some of this work—such as the theory of light quanta—remained controversial for years.[27][28]

At the age of 26, having studied under Alfred Kleiner, Professor of Experimental Physics, Einstein was awarded a PhD by the University of Zurich. His dissertation was entitled A New Determination of Molecular Dimensions. (Einstein 1905b)

## Light and general relativity

File:1919 eclipse positive.jpg
One of the 1919 eclipse photographs taken during Arthur Stanley Eddington's expedition, which confirmed Einstein's predictions of the gravitational bending of light.

In 1906, the patent office promoted Einstein to Technical Examiner Second Class, but he had not given up on academia. In 1908, he became a privatdozent at the University of Bern.[29] In 1910, he wrote a paper on critical opalescence that described the cumulative effect of light scattered by individual molecules in the atmosphere, i.e. why the sky is blue.[30]

During 1909, Einstein published "Über die Entwicklung unserer Anschauungen über das Wesen und die Konstitution der Strahlung" ("The Development of Our Views on the Composition and Essence of Radiation"), on the quantization of light. In this and in an earlier 1909 paper, Einstein showed that Max Planck's energy quanta must have well-defined momenta and act in some respects as independent, point-like particles. This paper introduced the photon concept (although the term itself was introduced by Gilbert N. Lewis in 1926) and inspired the notion of wave–particle duality in quantum mechanics.

In 1911, Einstein became an associate professor at the University of Zurich. However, shortly afterward, he accepted a full professorship at the Charles University of Prague. While in Prague, Einstein published a paper about the effects of gravity on light, specifically the gravitational redshift and the gravitational deflection of light. The paper appealed to astronomers to find ways of detecting the deflection during a solar eclipse.[31] German astronomer Erwin Finlay-Freundlich publicized Einstein's challenge to scientists around the world.[32]

In 1912, Einstein returned to Switzerland to accept a professorship at his alma mater, the ETH. There he met mathematician Marcel Grossmann who introduced him to Riemannian geometry, and at the recommendation of Italian mathematician Tullio Levi-Civita, Einstein began exploring the usefulness of general covariance (essentially the use of tensors) for his gravitational theory. Although for a while Einstein thought that there were problems with that approach, he later returned to it and by late 1915 had published his general theory of relativity in the form that is still used today (Einstein 1915). This theory explains gravitation as distortion of the structure of spacetime by matter, affecting the inertial motion of other matter.

After many relocations, Mileva established a permanent home with the children in Zurich in 1914, just before the start of World War I. Einstein continued on alone to Berlin, where he became a member of the Prussian Academy of Sciences. As part of the arrangements for his new position, he also became a professor at the Humboldt University of Berlin, although with a special clause freeing him from most teaching obligations. From 1914 to 1932 he was also director of the Kaiser Wilhelm Institute for Physics.[33]

During World War I, the speeches and writings of Central Powers scientists were available only to Central Powers academics, for national security reasons. Some of Einstein's work did reach the United Kingdom and the United States through the efforts of the Austrian Paul Ehrenfest and physicists in the Netherlands, especially 1902 Nobel Prize-winner Hendrik Lorentz and Willem de Sitter of the Leiden University. After the war ended, Einstein maintained his relationship with the Leiden University, accepting a contract as an Extraordinary Professor; he travelled to Holland regularly to lecture there between 1920 and 1930.[34]

In 1917, Einstein published an article in Physikalische Zeitschrift that proposed the possibility of stimulated emission, the physical process that makes possible the maser and the laser (Einstein 1917b). He also published a paper introducing a new notion, the cosmological constant, into the general theory of relativity in an attempt to model the behavior of the entire universe (Einstein 1917a).

1917 was the year astronomers began taking Einstein up on his 1911 challenge from Prague. The Mount Wilson Observatory in California, U.S., published a solar spectroscopic analysis that showed no gravitational redshift.[35] In 1918, the Lick Observatory, also in California, announced that they too had disproven Einstein's prediction, although their findings were not published.[36]

However, in May 1919, a team led by British astronomer Arthur Stanley Eddington claimed to have confirmed Einstein's prediction of gravitational deflection of starlight by the Sun while photographing a solar eclipse in Sobral, northern Brazil, and Príncipe.[32] On November 7, 1919, leading British newspaper The Times printed a banner headline that read: "Revolution in Science – New Theory of the Universe – Newtonian Ideas Overthrown".[37] In an interview Nobel laureate Max Born praised general relativity as the "greatest feat of human thinking about nature";[38] fellow laureate Paul Dirac was quoted saying it was "probably the greatest scientific discovery ever made".[39]

In their excitement, the world media made Albert Einstein world-famous. Ironically, later examination of the photographs taken on the Eddington expedition showed that the experimental uncertainty was of about the same magnitude as the effect Eddington claimed to have demonstrated, and in 1962 a British expedition concluded that the method used was inherently unreliable.[37] The deflection of light during a solar eclipse has, however, been more accurately measured (and confirmed) by later observations.[40]

There was some resentment toward the newcomer Einstein's fame in the scientific community, notably among German physicists, who later started the Deutsche Physik (German Physics) movement.[41][42]

## Nobel Prize

Einstein, 1921. Age 42.

In 1921 Einstein was awarded the Nobel Prize in Physics, "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect". This refers to his 1905 paper on the photoelectric effect: "On a Heuristic Viewpoint Concerning the Production and Transformation of Light", which was well supported by the experimental evidence by that time. The presentation speech began by mentioning "his theory of relativity [which had] been the subject of lively debate in philosophical circles [and] also has astrophysical implications which are being rigorously examined at the present time." (Einstein 1923) As stipulated in their 1919 divorce settlement, Einstein gave the Nobel prize money to his first wife, Mileva Marić.

Einstein traveled to New York City in the United States for the first time on April 2, 1921. When asked where he got his scientific ideas, Einstein explained that he believed scientific work best proceeds from an examination of physical reality and a search for underlying axioms, with consistent explanations that apply in all instances and avoid contradicting each other. He also recommended theories with visualizable results (Einstein 1954).[43]

## Unified field theory

Einstein's research after general relativity consisted primarily of a long series of attempts to generalize his theory of gravitation in order to unify and simplify the fundamental laws of physics, particularly gravitation and electromagnetism. In 1950, he described this "unified field theory" in a Scientific American article entitled "On the Generalized Theory of Gravitation" (Einstein 1950).

Although he continued to be lauded for his work in theoretical physics, Einstein became increasingly isolated in his research, and his attempts were ultimately unsuccessful. In his pursuit of a unification of the fundamental forces, he ignored some mainstream developments in physics (and vice versa), most notably the strong and weak nuclear forces, which were not well understood until many years after Einstein's death. Einstein's goal of unifying the laws of physics under a single model survives in the current drive for the grand unification theory.[44]

## Collaboration and conflict

### Bose–Einstein statistics

In 1924, Einstein received a description of a statistical model from Indian physicist Satyendra Nath Bose which showed that light could be understood as a gas. Bose's statistics applied to some atoms as well as to the proposed light particles, and Einstein submitted his translation of Bose's paper to the Zeitschrift für Physik. Einstein also published his own articles describing the model and its implications, among them the Bose–Einstein condensate phenomenon that should appear at very low temperatures (Einstein 1924). It was not until 1995 that the first such condensate was produced experimentally by Eric Allin Cornell and Carl Wieman using ultra-cooling equipment built at the NIST-JILA laboratory at the University of Colorado at Boulder.[45] Bose–Einstein statistics are now used to describe the behaviors of any assembly of "bosons". Einstein's sketches for this project may be seen in the Einstein Archive in the library of the Leiden University.[46]

### Schrödinger gas model

Einstein suggested to Erwin Schrödinger an application of Max Planck's idea of treating energy levels for a gas as a whole rather than for individual molecules, and Schrödinger applied this in a paper using the Boltzmann distribution to derive the thermodynamic properties of a semiclassical ideal gas. Schrödinger urged Einstein to add his name as co-author, although Einstein declined the invitation.[47]

### Einstein refrigerator

In 1926, Einstein and his former student Leó Szilárd, a Hungarian physicist who later worked on the Manhattan Project and is credited with the discovery of the chain reaction, co-invented (and in 1930, patented) the Einstein refrigerator, revolutionary for having no moving parts and using only heat, not ice, as an input.[48][49]

### Bohr versus Einstein

File:Niels Bohr Albert Einstein by Ehrenfest.jpg
Einstein and Niels Bohr. Photo taken by Paul Ehrenfest during their visit to Leiden in December 1925.

In the 1920s, quantum mechanics developed into a more complete theory. Einstein was unhappy with the "Copenhagen interpretation" of quantum theory developed by Niels Bohr and Werner Heisenberg, wherein quantum phenomena are inherently probabilistic, with definite states resulting only upon interaction with classical systems. A public debate between Einstein and Bohr followed, lasting for many years (including during the Solvay Conferences). Einstein formulated thought experiments against the Copenhagen interpretation, which were all rebutted by Bohr. In a 1926 letter to Max Born, Einstein wrote: "I, at any rate, am convinced that He [God] does not throw dice." (Einstein 1969).[50]

Einstein was never satisfied by what he perceived to be quantum theory's intrinsically incomplete description of nature, and in 1935 he further explored the issue in collaboration with Boris Podolsky and Nathan Rosen, noting that the theory seems to require non-local interactions; this is known as the EPR paradox (Einstein 1935). The EPR experiment has since been performed, with results confirming quantum theory's predictions.[51]

Einstein's disagreement with Bohr revolved around the idea of scientific determinism. For this reason the repercussions of the Einstein-Bohr debate have found their way into philosophical discourse as well.

## Religious views

The question of scientific determinism gave rise to questions about Einstein's position on theological determinism, and whether or not he believed in a God. In 1929, Einstein told Rabbi Herbert S. Goldstein "I believe in Spinoza's God, who reveals Himself in the lawful harmony of the world, not in a God Who concerns Himself with the fate and the doings of mankind."[52] In a 1950 letter to M. Berkowitz, Einstein stated that "My position concerning God is that of an agnostic. I am convinced that a vivid consciousness of the primary importance of moral principles for the betterment and ennoblement of life does not need the idea of a law-giver, especially a law-giver who works on the basis of reward and punishment."[53] Einstein also stated: "I have repeatedly said that in my opinion the idea of a personal God is a childlike one. You may call me an agnostic, but I do not share the crusading spirit of the professional atheist whose fervor is mostly due to a painful act of liberation from the fetters of religious indoctrination received in youth". He is reported to have said in a conversation with Hubertus, Prince of Löwenstein-Wertheim-Freudenberg "In view of such harmony in the cosmos which I, with my limited human mind, am able to recognize, there are yet people who say there is no God. But what really makes me angry is that they quote me for the support of such views."[54] Einstein clarified his religious views in a letter he wrote in response to those who claimed that he worshipped a Judeo-Christian god: "It was, of course, a lie what you read about my religious convictions, a lie which is being systematically repeated. I do not believe in a personal god and I have never denied this but have expressed it clearly. If something is in me which can be called religious then it is the unbounded admiration for the structure of the world so far as our science can reveal it."[54][55] In his book The World as I See It, he wrote: "A knowledge of the existence of something we cannot penetrate, of the manifestations of the profoundest reason and the most radiant beauty, which are only accessible to our reason in their most elementary forms—it is this knowledge and this emotion that constitute the truly religious attitude; in this sense, and in this alone, I am a deeply religious man."[56]

Einstein published a paper in Nature in 1940 entitled "Science and Religion" which gave his views on the subject.[57] He says that: "a person who is religiously enlightened appears to me to be one who has, to the best of his ability, liberated himself from the fetters of his selfish desires and is preoccupied with thoughts, feelings and aspirations to which he clings because of their super-personal value … regardless of whether any attempt is made to unite this content with a Divine Being, for otherwise it would not be possible to count Buddha and Spinoza as religious personalities. Accordingly a religious person is devout in the sense that he has no doubt of the significance of those super-personal objects and goals which neither require nor are capable of rational foundation … In this sense religion is the age-old endeavour of mankind to become clearly and completely conscious of these values and goals, and constantly to strengthen their effects." He argued that conflicts between science and religion "have all sprung from fatal errors." "[E]ven though the realms of religion and science in themselves are clearly marked off from each other" there are "strong reciprocal relationships and dependencies … science without religion is lame, religion without science is blind … a legitimate conflict between science and religion cannot exist." In Einstein's view, "neither the rule of human nor Divine Will exists as an independent cause of natural events. To be sure, the doctrine of a personal God interfering with natural events could never be refuted … by science, for [it] can always take refuge in those domains in which scientific knowledge has not yet been able to set foot." (Einstein 1940, pp. 605–607)

His friend Max Jammer explored Einstein's views on religion thoroughly in the 1999 book Einstein and Religion: Physics and Theology.[58]

In a letter written to Eric Gutkind in 1954 Einstein says: "The word god is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honourable, but still primitive legends which are nevertheless pretty childish. No interpretation no matter how subtle can (for me) change this".[59][60][61]

## Politics

File:Figh2.jpg
Einstein and Indian poet and Nobel laureate Rabindranath Tagore during their widely publicized July 14, 1930 conversation

With increasing public demands, his involvement in political, humanitarian, and academic projects in various countries, and his new acquaintances with scholars and political figures from around the world, Einstein was less able to achieve the productive isolation that he needed in order to work.[62] Due to his fame and genius, Einstein found himself called on to give conclusive judgments on matters that had nothing to do with theoretical physics or mathematics. He was not timid, and he was aware of the world around him, with no illusion that ignoring politics would make world events fade away. His very visible position allowed him to speak and write frankly, even provocatively, at a time when many people of conscience could only flee to the underground or keep doubts about developments within their own movements to themselves for fear of internecine fighting. Einstein flouted the ascendant Nazi movement, tried to be a voice of moderation in the tumultuous formation of the State of Israel and braved anti-communist politics and resistance to the civil rights movement in the United States. He participated in the 1927 congress of the League against Imperialism in Brussels.[63]

### Zionism

Einstein was a cultural Zionist. In 1931, The Macmillan Company published About Zionism: Speeches and Lectures by Professor Albert Einstein.[64] Querido, an Amsterdam publishing house, collected eleven of Einstein's essays into a 1933 book entitled Mein Weltbild, translated to English as The World as I See It; Einstein's foreword dedicates the collection "to the Jews of Germany".[65] In the face of Germany's rising militarism, Einstein wrote and spoke for peace.[66][67]

File:Einsteinwiezmann.PNG
Albert Einstein, seen here with his wife Elsa Einstein and Zionist leaders, including future President of Israel Chaim Weizmann, his wife Dr. Vera Weizmann, Menahem Ussishkin, and Ben-Zion Mossinson on arrival in New York City in 1921.

Despite his years of Zionist efforts, Einstein publicly stated reservations about the proposal to partition the British-supervised British Mandate of Palestine into independent Arab and Jewish countries. In a 1938 speech, "Our Debt to Zionism", he said: "I am afraid of the inner damage Judaism will sustain—especially from the development of a narrow nationalism within our own ranks, against which we have already had to fight strongly, even without a Jewish state. ... If external necessity should after all compel us to assume this burden [of a state], let us bear it with tact and patience."[68]

The United Nations did divide the mandate, demarcating the borders of several new countries including the State of Israel, and war broke out immediately. Einstein was one of the authors of a 1948 letter to the New York Times criticizing Menachem Begin's Revisionist Herut (Freedom) Party for the Deir Yassin massacre (Einstein et al. 1948).

Einstein served on the Board of Governors of The Hebrew University of Jerusalem. In his Will of 1950, Einstein bequeathed literary rights to his writings to The Hebrew University, where many of his original documents are held in the Albert Einstein Archives.[69]

When President Chaim Weizmann died in 1952, Einstein was asked to be Israel's second president, but he declined. He wrote: "I am deeply moved by the offer from our State of Israel, and at once saddened and ashamed that I cannot accept it."[70]

### Anti-Nazism

In January 1933, Adolf Hitler was appointed Chancellor of Germany. One of the first actions of Hitler's administration was the Law for the Restoration of the Professional Civil Service which removed Jews and politically suspect government employees (including university professors) from their jobs, unless they had demonstrated their loyalty to Germany by serving in World War I. In December 1932, in response to this growing threat, Einstein had prudently traveled to the U.S. For several years he had been wintering at the California Institute of Technology in Pasadena, California,[71] and also was a guest lecturer at Abraham Flexner's newly founded Institute for Advanced Study in Princeton, New Jersey.[72]

The Einsteins bought a house in Princeton (where Elsa died in 1936), and Einstein remained an integral contributor to the Institute for Advanced Study until his death in 1955. During the 1930s and into World War II, Einstein wrote affidavits recommending United States visas for a huge number of Jews from Europe trying to flee persecution, raised money for Zionist organizations and was in part responsible for the formation, in 1933, of the International Rescue Committee.[73][74]

File:Citizen-Einstein.jpg
Albert Einstein receiving his certificate of American citizenship from Judge Phillip Forman in 1940.

Meanwhile in Germany, a campaign to eliminate Einstein's work from the German lexicon as unacceptable "Jewish physics" (Jüdische physik) was led by Nobel laureates Philipp Lenard and Johannes Stark. Deutsche Physik activists published pamphlets and even textbooks denigrating Einstein, and instructors who taught his theories were blacklisted—including Nobel laureate Werner Heisenberg, who had debated quantum probability with Bohr and Einstein. Philipp Lenard claimed that the mass–energy equivalence formula needed to be credited to Friedrich Hasenöhrl to make it an Aryan creation.[75][76]

Einstein became a citizen of the United States in 1940 and remained there the rest of his life, although he retained his Swiss citizenship.[77]

### Atomic bomb

File:Einstein-Roosevelt-letter.png
Einstein-Szilárd letter

Concerned scientists, many of them refugees from European anti-Semitism in the U.S., recognized the danger of German scientists developing an atomic bomb based on the newly-discovered phenomena of nuclear fission. In 1939, the Hungarian émigré Leó Szilárd, having failed to arouse U.S. government interest on his own, worked with Einstein to write a letter to U.S. President Franklin Delano Roosevelt, which Einstein signed, urging U.S. development of such a weapon.[78] In August 1939, Roosevelt received the Einstein-Szilárd letter and authorized secret research into the harnessing of nuclear fission for military purposes.[79]

By 1942 this effort had become the Manhattan Project, the largest secret scientific endeavor undertaken up to that time. By late 1945, the U.S. had developed operational nuclear weapons, and used them on the Japanese cities of Hiroshima and Nagasaki. Einstein himself did not play a role in the development of the atomic bomb other than signing the letter. He did help the United States Navy with some unrelated theoretical questions it was working on during the war.[80]

According to Linus Pauling, Einstein later expressed regret about his letter to Roosevelt.[81] In 1947, Einstein wrote an article for The Atlantic Monthly arguing that the United States should not try to pursue an atomic monopoly, and instead should equip the United Nations with nuclear weapons for the sole purpose of maintaining deterrence.[82]

### Cold War era

When he was a visible figure working against the rise of Nazism, Einstein had sought help and developed working relationships in both the West and what was to become the Soviet bloc. After World War II, enmity between the former allies became a very serious issue for people with international résumés. To make things worse, during the first days of McCarthyism Einstein was writing about a single world government; it was at this time that he wrote, "I do not know how the third World War will be fought, but I can tell you what they will use in the Fourth—rocks!"[83] In a 1949 Monthly Review article entitled "Why Socialism?"[84] Albert Einstein described a chaotic capitalist society, a source of evil to be overcome, as the "predatory phase of human development" (Einstein 1949). With Albert Schweitzer and Bertrand Russell, Einstein lobbied to stop nuclear testing and future bombs. Days before his death, Einstein signed the Russell-Einstein Manifesto, which led to the Pugwash Conferences on Science and World Affairs.[85]

Einstein was a member of several civil rights groups, including the Princeton chapter of the NAACP. When the aged W. E. B. Du Bois was accused of being a Communist spy, Einstein volunteered as a character witness, and the case was dismissed shortly afterward. Einstein's friendship with activist Paul Robeson, with whom he served as co-chair of the American Crusade to End Lynching, lasted twenty years.[86]

In 1946, Einstein collaborated with Rabbi Israel Goldstein, Middlesex heir C. Ruggles Smith, and activist attorney George Alpert on the Albert Einstein Foundation for Higher Learning, Inc., which was formed to create a Jewish-sponsored secular university, open to all students, on the grounds of the former Middlesex College in Waltham, Massachusetts. Middlesex was chosen in part because it was accessible from both Boston and New York City, Jewish cultural centers of the U.S. Their vision was a university "deeply conscious both of the Hebraic tradition of Torah looking upon culture as a birthright, and of the American ideal of an educated democracy."[87] The collaboration was stormy, however. Finally, when Einstein wanted to appoint British economist Harold Laski as the university's president, Alpert wrote that Laski was "a man utterly alien to American principles of democracy, tarred with the Communist brush."[87] Einstein withdrew his support and barred the use of his name.[88] The university opened in 1948 as Brandeis University. In 1953, Brandeis offered Einstein an honorary degree, but he declined.[87]

Given Einstein's links to Germany and Zionism, his socialistic ideals, and his links to Communist figures, the U.S. Federal Bureau of Investigation kept a file on Einstein[89] that grew to 1,427 pages. Many of the documents in the file were sent to the FBI by concerned citizens: some objecting to his immigration, while others asked the FBI to protect him.[90]

Although Einstein had long been sympathetic to the notion of vegetarianism, it was only near the start of 1954 that he adopted a strict vegetarian diet.[91]

## Death

On April 17, 1955, Albert Einstein experienced internal bleeding caused by the rupture of an aortic aneurysm, which had previously been diagnosed and reinforced.[92] He took a draft of a speech he was preparing for a television appearance commemorating the State of Israel's seventh anniversary with him to the hospital, but he did not live long enough to complete it.[93] He died in Princeton Hospital early the next morning at the age of 76, having continued to work until near the end. Einstein's remains were cremated and his ashes were scattered.[94][95]

Before the cremation, Princeton Hospital pathologist Thomas Stoltz Harvey removed Einstein's brain for preservation, without the permission of his family, in hope that the neuroscience of the future would be able to discover what made Einstein so intelligent.[96]

## Legacy

While travelling, Einstein had written daily to his wife Elsa and adopted stepdaughters, Margot and Ilse, and the letters were included in the papers bequeathed to The Hebrew University. Margot Einstein permitted the personal letters to be made available to the public, but requested that it not be done until twenty years after her death (she died in 1986[97]). Barbara Wolff, of The Hebrew University's Albert Einstein Archives, told the BBC that there are about 3,500 pages of private correspondence written between 1912 and 1955.[98]

The United States' National Academy of Sciences commissioned the Albert Einstein Memorial, a monumental bronze and marble sculpture by Robert Berks, dedicated in 1979 at its Washington, D.C. campus adjacent to the National Mall.

Einstein bequeathed the royalties from use of his image to The Hebrew University of Jerusalem. The Roger Richman Agency licenses the use of his name and associated imagery, as agent for the Hebrew University.[99]

## Honors

In 1999, Albert Einstein was named "Person of the Century" by Time magazine,[100][101] the Gallup poll recorded him as the fourth most admired person of the 20th century[102] and according to The 100: A Ranking of the Most Influential Persons in History, Einstein is "the greatest scientist of the twentieth century and one of the supreme intellects of all time."[103]

File:Einstein Memorial.jpg
Albert Einstein Memorial located on the public grounds of the U.S. National Academy of Sciences, Washington, D.C.

A partial list of his memorials:

In 1990, his name was added to the Walhalla temple.[105]

## Impact on popular culture

In the period before World War II, Albert Einstein was so well-known in America that he would be stopped on the street by people wanting him to explain "that theory". He finally figured out a way to handle the incessant inquiries. He told his inquirers "Pardon me, sorry! Always I am mistaken for Professor Einstein."[106]

Albert Einstein has been the subject of or inspiration for many novels, films, and plays. Einstein is a favorite model for depictions of mad scientists and absent-minded professors; his expressive face and distinctive hairstyle have been widely copied and exaggerated. Time magazine's Frederic Golden wrote that Einstein was "a cartoonist's dream come true."[107]

## Publications

The following publications by Albert Einstein are referenced in this article. A more complete list of his publications may be found at Works by Albert Einstein.

• Einstein, Albert (1901), "Folgerungen aus den Capillaritätserscheinungen (Conclusions Drawn from the Phenomena of Capillarity)", Annalen der Physik, 4, p. 513
• Einstein, Albert (1905a), "On a Heuristic Viewpoint Concerning the Production and Transformation of Light", Annalen der Physik, 17: 132–148. This annus mirabilis paper on the photoelectric effect was received by Annalen der Physik March 18.
• Einstein, Albert (1905b), A new determination of molecular dimensions. This PhD thesis was completed April 30 and submitted July 20.
• Einstein, Albert (1905c), "On the Motion—Required by the Molecular Kinetic Theory of Heat—of Small Particles Suspended in a Stationary Liquid", Annalen der Physik, 17: 549–560. This annus mirabilis paper on Brownian motion was received May 11.
• Einstein, Albert (1905d), "On the Electrodynamics of Moving Bodies", Annalen der Physik, 17: 891–921. This annus mirabilis paper on special relativity was received June 30.
• Einstein, Albert (1905e), "Does the Inertia of a Body Depend Upon Its Energy Content?", Annalen der Physik, 18: 639–641. This annus mirabilis paper on mass-energy equivalence was received September 27.
• Einstein, Albert (1915), "Die Feldgleichungen der Gravitation (The Field Equations of Gravitation)", Koniglich Preussische Akademie der Wissenschaften: 844–847
• Einstein, Albert (1917a), "Kosmologische Betrachtungen zur allgemeinen Relativitätstheorie (Cosmological Considerations in the General Theory of Relativity)", Koniglich Preussische Akademie der Wissenschaften
• Einstein, Albert (1917b), "Zur Quantentheorie der Strahlung (On the Quantum Mechanics of Radiation)", Physikalische Zeitschrift, 18: 121–128
• Einstein, Albert (July 11, 1923), "Fundamental Ideas and Problems of the Theory of Relativity", Nobel Lectures, Physics 1901–1921 (PDF), Amsterdam: Elsevier Publishing Company, retrieved 2007-03-25
• Einstein, Albert (1924), "Quantentheorie des einatomigen idealen Gases (Quantum theory of monatomic ideal gases)", Sitzungsberichte der Preussichen Akademie der Wissenschaften Physikalisch—Mathematische Klasse: 261–267. First of a series of papers on this topic.
• Einstein, Albert (1926), "Die Ursache der Mäanderbildung der Flussläufe und des sogenannten Baerschen Gesetzes", Die Naturwissenschaften: 223–224. On Baer's law and meanders in the courses of rivers.
• Einstein, Albert; Podolsky, Boris; Rosen, Nathan (May 15, 1935), "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?", Physical Review, 47 (10): 777–780
• Einstein, Albert (1940), "On Science and Religion", Nature, 146
• Einstein, Albert; et al. (December 4, 1948), "To the editors", New York Times
• Einstein, Albert (May 1949), "Why Socialism?", Monthly Review, retrieved 2006-01-16
• Einstein, Albert (1950), "On the Generalized Theory of Gravitation", Scientific American, CLXXXII (4): 13–17
• Einstein, Albert (1954), Ideas and Opinions, New York: Random House, ISBN 0-517-00393-7
• Einstein, Albert (1969), Albert Einstein, Hedwig und Max Born: Briefwechsel 1916–1955 (in German), Munich: Nymphenburger Verlagshandlung
• Einstein, Albert (1979), Autobiographical Notes, translated by Paul Arthur Schilpp (Centennial ed.), Chicago: Open Court, ISBN 0-875-48352-6. The chasing a light beam thought experiment is described on pages 48–51.
• Collected Papers: Stachel, John, Martin J. Klein, a. J. Kox, Michel Janssen, R. Schulmann, Diana Komos Buchwald (Eds.); et al. (1987–2006). The Collected Papers of Albert Einstein, Vol 1–10. Princeton University Press. Further information about the volumes published so far can be found on the webpages of the Einstein Papers Project.

## Notes

1. "The Nobel Prize in Physics 1921". Nobel Foundation. Retrieved 2007-03-06.
2. These include: About Zionism: Speeches and Lectures by Professor Albert Einstein (1930), "Why War?" (1933, co-authored by Sigmund Freud), The World As I See It (1934), Out of My Later Years (1950), and a book on science for the general reader, The Evolution of Physics (1938, co-authored by Leopold Infeld).
3. "Albert Einstein - Biography". Nobel Foundation. Retrieved 2007-03-07.
4. Durrani, Matin. "Physics: past, present, future". Physics World. Retrieved 2007-11-27.
5. Rosenkranz, Ze'ev (2005), Albert Einstein — Derrière l'image, Editions NZZ, Zürich, p. 29, ISBN 3-03823-182-7
6. Thomas Sowell used Einstein's name for a book on such children. Sowell, Thomas (2001). The Einstein Syndrome: Bright Children Who Talk Late. Basic Books. pp. 89–150. ISBN 0-465-08140-1.
7. Schilpp (Ed.), P. A. (1979). Albert Einstein — Autobiographical Notes. Open Court. pp. 8–9.
8. Dudley Herschbach, "Einstein as a Student," Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA, page 3, web: HarvardChem-Einstein-PDF: about Max Talmud visited on Thursdays for six years.
9. Mehra, Jagdish. "Albert Einstein's first paper" (PDF). Retrieved 2007-03-04.
10. Highfield, Roger (1993), The Private Lives of Albert Einstein, London: Faber and Faber, p. 21, ISBN 0-571-17170-2 Unknown parameter `|coauthors=` ignored (help)
11. Highfield (1993, pp. 21,31,56–57)
12. Ibid.[citation needed]
13. "A Brief Biography of Albert Einstein". 2005. Retrieved 2007-06-11. Unknown parameter `|month=` ignored (help)
14. "Einstein's nationalities at einstein-website.de". Unknown parameter `|accessyear=` ignored (`|access-date=` suggested) (help); Unknown parameter `|accessmonthday=` ignored (help)
15. Now the "Swiss Federal Institute of Intellectual Property". Unknown parameter `|accessyear=` ignored (`|access-date=` suggested) (help); Unknown parameter `|accessmonthday=` ignored (help). See also their "FAQ about Einstein and the Institute".
16. Peter Galison, "Einstein's Clocks: The Question of Time" Critical Inquiry 26, no. 2 (Winter 2000): 355–389.
17. Galison, Peter (2003). Einstein's Clocks, Poincaré's Maps: Empires of Time. New York: W.W. Norton. ISBN 0393020010.
18. E.g. Pais, Abraham (1982), Subtle is the Lord. The Science and the Life of Albert Einstein, Oxford University Press, p. 17, ISBN 0-19-520438-7
19. This conclusion is from Einstein's correspondence with Marić. Lieserl is first mentioned in a letter from Einstein to Marić (who was abroad at the time of Lieserl's birth) dated February 4, 1902 (Collected papers Vol. 1, document 134).
20. Highfield (1993, pp. 54,58): "she did not seem to care that Mileva was not Jewish"
21. Oregon Public Broadcasting (2003), Einstein's Wife: The Life of Mileva Maric Einstein, Public Broadcasting Service, retrieved 2006-11-8 Check date values in: `|access-date=` (help) This web site, companion to the controversial Geraldine Hilton documentary of the same name, is currently under review for historical accuracy. (See Getler, Michael (December 15, 2006), "Einstein's Wife: The Relative Motion of 'Facts'", PBS Ombudsman, retrieved 2007-03-25.)
22. Letter Einstein to Marić on October 3, 1900 (Collected Papers Vol. 1, document 79).
23. Alberto A Martínez. "Arguing about Einstein's wife (April 2004) - Physics World - PhysicsWeb (See above)". Unknown parameter `|accessyear=` ignored (`|access-date=` suggested) (help); Unknown parameter `|accessmonthday=` ignored (help)
24. Allen Esterson. "Mileva Marić: Einstein's Wife". Retrieved 2007-02-23.
25. John Stachel. ""Albert Einstein and Mileva Maric. A Collaboration That Failed to Develop" in: Creative Couples in the Sciences, H. M. Pycior et al. (ed)" (PDF). Retrieved 2007-02-23.
26. "Short life history: Elsa Einstein". Retrieved 2007-06-11.
27. On the reception of relativity theory around the world, and the different controversies it encountered, see the articles in Thomas F. Glick, ed., The Comparative Reception of Relativity (Kluwer Academic Publishers, 1987), ISBN 9027724989.
28. Pais, Abraham (1982), Subtle is the Lord. The Science and the Life of Albert Einstein, Oxford University Press, pp. 382–386, ISBN 0-19-520438-7
29. Pais, Abraham (1982), Subtle is the Lord. The Science and the Life of Albert Einstein, Oxford University Press, p. 522, ISBN 0-19-520438-7
30. Levenson, Thomas. "Einstein's Big Idea." Public Broadcasting Service. 2005. Retrieved on February 25, 2006.
31. Einstein, Albert (1911). "On the Influence of Gravity on the Propagation of Light". Annalen der Physik. 35: 898–908. (also in Collected Papers Vol. 3, document 23)
32. Crelinsten, Jeffrey. "Einstein's Jury: The Race to Test Relativity." Princeton University Press. 2006. Retrieved on March 13, 2007. ISBN 9780691123103
33. Kant, Horst. "Albert Einstein and the Kaiser Wilhelm Institute for Physics in Berlin." in Renn, Jürgen. "Albert Einstein - Chief Engineer of the Universe: One Hundred Authors for Einstein." Ed. Renn, Jürgen. Wiley-VCH. 2005. pp. 166–169. ISBN = 3527405747
34. "Two friends in Leiden". Retrieved 2007-06-11.
35. Crelinsten, Jeffrey (2006), Einstein's Jury: The Race to Test Relativity, Princeton University Press, pp. 103–108, ISBN 978-0-691-12310-3, retrieved 2007-03-13
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37. Andrzej, Stasiak (2003). "Myths in science". EMBO reports. 4 (3): 236. doi:10.1038/sj.embor.embor779. Retrieved 2007-03-31.
38. "The genius of space and time". The Guardian. September 17, 2005. Retrieved 2007-03-31.
39. Schmidhuber, Jürgen. "ALBERT EINSTEIN (1879–1955) and the 'Greatest Scientific Discovery Ever'." 2006. Retrieved on October 4, 2006.
40. See the table in MathPages Bending Light
41. Hentschel, Klaus; Hentschel, Ann M. "Physics and National Socialism: An Anthology of Primary Sources." Birkhaeuser Verlag. 1996. p. xxi. ISBN 3764353120
42. For a discussion of astronomers' attitudes and debates about relativity, see Jeffrey Crelinsten, Einstein's Jury: The Race to Test Relativity (Princeton University Press, 2006), esp. chapters 6, 9, 10 and 11.
43. See Albert Einstein, "Geometry and Experience," (1921), reprinted in Ideas and Opinions.
44. "A Unified Physics by 2050?". Retrieved 2007-10-04.
45. "Cornell and Wieman Share 2001 Nobel Prize in Physics". 2001-10-09. Retrieved 2007-06-11.
46. "Einstein archive at the Instituut-Lorentz." Instituut-Lorentz. 2005. Retrieved on November 21, 2005.
47. Moore, Walter (1989). Schrödinger: Life and Thought. Cambridge: Cambridge University Press. ISBN 0-521-43767-9.
48. Goettling, Gary. "Einstein's Refrigerator." Georgia Tech Alumni Magazine. 1998. Retrieved on November 21, 2005.
49. On November 11, 1930, U.S. Patent 1,781,541 was awarded to Albert Einstein and Leó Szilárd for the refrigerator.
50. A reprint of this book was published by Edition Erbrich in 1982, ISBN 388682005X
51. Aspect, Alain; Dalibard, Jean; Roger, Gérard (1982). "Experimental test of Bell's inequalities using time-varying analyzers". Physical Review Letters. 49 (25): 1804–1807. The first of many experimental tests relating to EPR.
52. Brian, Dennis (1996), Einstein: A Life, New York: John Wiley & Sons, p. 127, ISBN 0-471-11459-6
53. Albert Einstein in a letter to M. Berkowitz, October 25, 1950; Einstein Archive 59-215; from Alice Calaprice, ed., The Expanded Quotable Einstein, Princeton, New Jersey: Princeton University Press, 2000, p. 216.
54. "Albert Einstein (1879-1955)". Retrieved 2007-05-21.
55. Helen Dukas and Banesh Hoffman (eds) (1981). Albert Einstein, The Human Side. Princeton University Press. p. 43.
56. Einstein, Albert (1949). The World as I See It. New York: Philosophical Library. ISBN 0806527900. Retrieved 2007-10-14.
57. Einstein, A. (1940). "Science and religion". Nature. 146: 605–607.
58. Jammer, Max (1999), Einstein and Religion, Princeton University Press, ISBN 0-691-00699-7
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62. Clark, Ronald W. (1971), Einstein: The Life and Times, Avon, ISBN 0-380-44123-3
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64. ASIN: B00085M906
65. Available in reprint paperback from Filiquarian Publishing, LLC, ISBN 1599869659.
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67. See the AMNH site's popup of translated letter from Freud, in the section "Freud and Einstein", regarding proposed joint presentation on "What can be done to rid mankind of the menace of war?"
68. Rowe, David E.; Schulmann, Robert (2007), Einstein on Politics: His Private Thoughts and Public Stands on Nationalism, Zionism, War, Peace, and the Bomb, Princeton University Press, ISBN 0691120943
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72. Hakim, Joy (1995). A History of Us: War, Peace and all that Jazz. New York: Oxford University Press. ISBN 0-19-509514-6.
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74. The International Rescue Committee gives support and shelter to refugees of social and political persecution.
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79. The Atomic Heritage Foundation. "Einstein's Letter to Franklin D. Roosevelt". Retrieved 2007-05-26.
80. Schwarz, Frederic (1998-04). "Einstein's Ordnance". AmericanHeritage.com. Retrieved 2008-03-23. Check date values in: `|date=` (help)
81. Scientist Tells of Einstein's A-bomb Regrets. The Philadelphia Bulletin, 13 May 1955. (PDF document from the Swiss Federal Archives from Internet Archive.)
82. Einstein, Albert (1947). "Atomic War or Peace". Atlantic Monthly. Retrieved 2008-03-23. Unknown parameter `|month=` ignored (help)
83. Calaprice, Alice (2005), The new quotable Einstein, Princeton University Press, p. 173, ISBN 0-691-12075-7 Other versions of the quote exist.
84. "Why Socialism?". Retrieved 2007-06-30.
85. Butcher, Sandra Ionno (May 2005). "The Origins of the Russell-Einstein Manifesto" (PDF). Council of the Pugwash Conferences on Science and World Affairs. Retrieved 2007-05-02.
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91. "The Case of the Scientist with a Pulsating Mass". 2002-06-14. Retrieved 2007-06-11.
92. Albert Einstein Archives (April 1955), "Draft of projected Telecast Israel Independence Day, April 1955 (last statement ever written)", Einstein Archives Online, retrieved 2007-03-14
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95. "The Long, Strange Journey of Einstein's Brain". Retrieved 2007-10-03.
96. New York Times obituary [1]
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101. "Mother Teresa Voted by American People as Most Admired Person of the Century". 1999-12-31. Retrieved 2007-06-11.
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