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This aversion to war also led Einstein to befriend author Upton Sinclair and film star Charlie Chaplin , both noted for their pacifism. Carl Laemmle , head of Universal Studios , gave Einstein a tour of his studio and introduced him to Chaplin.
They had an instant rapport, with Chaplin inviting Einstein and his wife, Elsa, to his home for dinner. Chaplin speculated that it was "possibly used as kindling wood by the Nazis.
While at American universities in early , he undertook his third two-month visiting professorship at the California Institute of Technology in Pasadena.
He and his wife Elsa returned to Belgium by ship in March, and during the trip they learned that their cottage was raided by the Nazis and his personal sailboat confiscated.
Upon landing in Antwerp on 28 March, he immediately went to the German consulate and surrendered his passport, formally renouncing his German citizenship.
In April , Einstein discovered that the new German government had passed laws barring Jews from holding any official positions, including teaching at universities.
I must confess that the degree of their brutality and cowardice came as something of a surprise. Einstein was now without a permanent home, unsure where he would live and work, and equally worried about the fate of countless other scientists still in Germany.
He rented a house in De Haan, Belgium, where he lived for a few months. In late July , he went to England for about six weeks at the personal invitation of British naval officer Commander Oliver Locker-Lampson , who had become friends with Einstein in the preceding years.
To protect Einstein, Locker-Lampson had two assistants watch over him at his secluded cottage outside London, with a photo of them carrying shotguns and guarding Einstein, published in the Daily Herald on 24 July British historian Martin Gilbert notes that Churchill responded immediately, and sent his friend, physicist Frederick Lindemann , to Germany to seek out Jewish scientists and place them in British universities.
Locker-Lampson also submitted a bill to parliament to extend British citizenship to Einstein, during which period Einstein made a number of public appearances describing the crisis brewing in Europe.
In October Einstein returned to the US and took up a position at the Institute for Advanced Study,   noted for having become a refuge for scientists fleeing Nazi Germany.
Einstein was still undecided on his future. He had offers from several European universities, including Christ Church, Oxford where he stayed for three short periods between May and June and was offered a 5-year studentship,   but in he arrived at the decision to remain permanently in the United States and apply for citizenship.
The two would take long walks together discussing their work. Bruria Kaufman , his assistant, later became a physicist.
During this period, Einstein tried to develop a unified field theory and to refute the accepted interpretation of quantum physics , both unsuccessfully.
The letter is believed to be "arguably the key stimulus for the U. For Einstein, "war was a disease Einstein became an American citizen in Not long after settling into his career at the Institute for Advanced Study in Princeton, New Jersey , he expressed his appreciation of the meritocracy in American culture when compared to Europe.
He recognized the "right of individuals to say and think what they pleased", without social barriers, and as a result, individuals were encouraged, he said, to be more creative, a trait he valued from his own early education.
Du Bois and was prepared to testify on his behalf during his trial in In Einstein visited Lincoln University in Pennsylvania, a historically black college , where he was awarded an honorary degree.
Lincoln was the first university in the United States to grant college degrees to African Americans ; alumni include Langston Hughes and Thurgood Marshall.
Einstein gave a speech about racism in America, adding, "I do not intend to be quiet about it. Einstein was a figurehead leader in helping establish the Hebrew University of Jerusalem , which opened in , and was among its first Board of Governors.
Earlier, in , he was asked by the biochemist and president of the World Zionist Organization , Chaim Weizmann , to help raise funds for the planned university.
Among those, he advised first creating an Institute of Agriculture in order to settle the undeveloped land. Einstein developed an appreciation for music at an early age, and later wrote: I often think in music.
I live my daydreams in music. I see my life in terms of music I get most joy in life out of music. His mother played the piano reasonably well and wanted her son to learn the violin , not only to instill in him a love of music but also to help him assimilate into German culture.
According to conductor Leon Botstein , Einstein began playing when he was 5, although he did not enjoy it at that age.
He taught himself to play without "ever practicing systematically", he said, deciding that "love is a better teacher than a sense of duty.
Music possessed an unusual meaning for this student. Although the idea of becoming a professional musician himself was not on his mind at any time, among those with whom Einstein played chamber music were a few professionals, and he performed for private audiences and friends.
Einstein was deeply impressed by Mahatma Gandhi. He exchanged written letters with Gandhi, and called him "a role model for the generations to come" in a letter writing about him.
Einstein spoke of his spiritual outlook in a wide array of original writings and interviews. And one life is enough for me.
He served on the advisory board of the First Humanist Society of New York ,  and was an honorary associate of the Rationalist Association , which publishes New Humanist in Britain.
For the seventy-fifth anniversary of the New York Society for Ethical Culture , he stated that the idea of Ethical Culture embodied his personal conception of what is most valuable and enduring in religious idealism.
On 17 April , Einstein experienced internal bleeding caused by the rupture of an abdominal aortic aneurysm , which had previously been reinforced surgically by Rudolph Nissen in Einstein refused surgery, saying, "I want to go when I want.
It is tasteless to prolong life artificially. I have done my share; it is time to go. I will do it elegantly. Robert Oppenheimer summarized his impression of Einstein as a person: There was always with him a wonderful purity at once childlike and profoundly stubborn.
Throughout his life, Einstein published hundreds of books and articles. These four works contributed substantially to the foundation of modern physics and changed views on space , time, and matter.
The four papers are:. Two papers he published in — thermodynamics attempted to interpret atomic phenomena from a statistical point of view.
These papers were the foundation for the paper on Brownian motion, which showed that Brownian movement can be construed as firm evidence that molecules exist.
His research in and was mainly concerned with the effect of finite atomic size on diffusion phenomena. Einstein returned to the problem of thermodynamic fluctuations, giving a treatment of the density variations in a fluid at its critical point.
Ordinarily the density fluctuations are controlled by the second derivative of the free energy with respect to the density. At the critical point, this derivative is zero, leading to large fluctuations.
The effect of density fluctuations is that light of all wavelengths is scattered, making the fluid look milky white. Einstein relates this to Rayleigh scattering , which is what happens when the fluctuation size is much smaller than the wavelength, and which explains why the sky is blue.
This paper predicted that, when measured in the frame of a relatively moving observer, a clock carried by a moving body would appear to slow down , and the body itself would contract in its direction of motion.
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 originally framed special relativity in terms of kinematics the study of moving bodies. In , Hermann Minkowski reinterpreted special relativity in geometric terms as a theory of spacetime.
General relativity GR is a theory of gravitation that was developed by Einstein between and According to general relativity , the observed gravitational attraction between masses results from the warping of space and time by those masses.
General relativity has developed into an essential tool in modern astrophysics. It provides the foundation for the current understanding of black holes , regions of space where gravitational attraction is so strong that not even light can escape.
As Einstein later said, the reason for the development of general relativity was that the preference of inertial motions within special relativity was unsatisfactory, while a theory which from the outset prefers no state of motion even accelerated ones should appear more satisfactory.
In that article titled "On the Relativity Principle and the Conclusions Drawn from It", he argued that free fall is really inertial motion, and that for a free-falling observer the rules of special relativity must apply.
This argument is called the equivalence principle. In the same article, Einstein also predicted the phenomena of gravitational time dilation , gravitational red shift and deflection of light.
In , Einstein published another article "On the Influence of Gravitation on the Propagation of Light" expanding on the article, in which he estimated the amount of deflection of light by massive bodies.
Thus, the theoretical prediction of general relativity could for the first time be tested experimentally. In , Einstein predicted gravitational waves ,   ripples in the curvature of spacetime which propagate as waves , traveling outward from the source, transporting energy as gravitational radiation.
The existence of gravitational waves is possible under general relativity due to its Lorentz invariance which brings the concept of a finite speed of propagation of the physical interactions of gravity with it.
By contrast, gravitational waves cannot exist in the Newtonian theory of gravitation , which postulates that the physical interactions of gravity propagate at infinite speed.
While developing general relativity, Einstein became confused about the gauge invariance in the theory. He formulated an argument that led him to conclude that a general relativistic field theory is impossible.
He gave up looking for fully generally covariant tensor equations, and searched for equations that would be invariant under general linear transformations only.
In June , the Entwurf "draft" theory was the result of these investigations. As its name suggests, it was a sketch of a theory, less elegant and more difficult than general relativity, with the equations of motion supplemented by additional gauge fixing conditions.
After more than two years of intensive work, Einstein realized that the hole argument was mistaken  and abandoned the theory in November In , Einstein applied the general theory of relativity to the structure of the universe as a whole.
As observational evidence for a dynamic universe was not known at the time, Einstein introduced a new term, the cosmological constant , to the field equations, in order to allow the theory to predict a static universe.
Following the discovery of the recession of the nebulae by Edwin Hubble in , Einstein abandoned his static model of the universe, and proposed two dynamic models of the cosmos, The Friedmann-Einstein universe of   and the Einstein—de Sitter universe of In many Einstein biographies, it is claimed that Einstein referred to the cosmological constant in later years as his "biggest blunder".
The astrophysicist Mario Livio has recently cast doubt on this claim, suggesting that it may be exaggerated. For the density to remain constant, new particles of matter must be continually formed in the volume from space.
It thus appears that Einstein considered a steady-state model of the expanding universe many years before Hoyle, Bondi and Gold.
General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum.
Einstein argued that this is true for fundamental reasons, because the gravitational field could be made to vanish by a choice of coordinates.
He maintained that the non-covariant energy momentum pseudotensor was in fact the best description of the energy momentum distribution in a gravitational field.
This approach has been echoed by Lev Landau and Evgeny Lifshitz , and others, and has become standard. In , Einstein collaborated with Nathan Rosen to produce a model of a wormhole , often called Einstein—Rosen bridges.
These solutions cut and pasted Schwarzschild black holes to make a bridge between two patches. If one end of a wormhole was positively charged, the other end would be negatively charged.
These properties led Einstein to believe that pairs of particles and antiparticles could be described in this way.
In order to incorporate spinning point particles into general relativity, the affine connection needed to be generalized to include an antisymmetric part, called the torsion.
This modification was made by Einstein and Cartan in the s. The theory of general relativity has a fundamental law—the Einstein equations which describe how space curves, the geodesic equation which describes how particles move may be derived from the Einstein equations.
Since the equations of general relativity are non-linear, a lump of energy made out of pure gravitational fields, like a black hole, would move on a trajectory which is determined by the Einstein equations themselves, not by a new law.
So Einstein proposed that the path of a singular solution, like a black hole, would be determined to be a geodesic from general relativity itself.
This was established by Einstein, Infeld, and Hoffmann for pointlike objects without angular momentum, and by Roy Kerr for spinning objects.
In a paper,  Einstein postulated that light itself consists of localized particles quanta. He does not say much more, because he is not sure how the particles are related to the wave.
But he does suggest that this idea would explain certain experimental results, notably the photoelectric effect. In , Einstein proposed a model of matter where each atom in a lattice structure is an independent harmonic oscillator.
In the Einstein model, each atom oscillates independently—a series of equally spaced quantized states for each oscillator. Einstein was aware that getting the frequency of the actual oscillations would be difficult, but he nevertheless proposed this theory because it was a particularly clear demonstration that quantum mechanics could solve the specific heat problem in classical mechanics.
Peter Debye refined this model. Throughout the s, quantum mechanics expanded in scope to cover many different systems.
After Ernest Rutherford discovered the nucleus and proposed that electrons orbit like planets, Niels Bohr was able to show that the same quantum mechanical postulates introduced by Planck and developed by Einstein would explain the discrete motion of electrons in atoms, and the periodic table of the elements.
Einstein contributed to these developments by linking them with the arguments Wilhelm Wien had made. Wien had shown that the hypothesis of adiabatic invariance of a thermal equilibrium state allows all the blackbody curves at different temperature to be derived from one another by a simple shifting process.
Einstein noted in that the same adiabatic principle shows that the quantity which is quantized in any mechanical motion must be an adiabatic invariant.
Arnold Sommerfeld identified this adiabatic invariant as the action variable of classical mechanics. In , Einstein received a description of a statistical model from Indian physicist Satyendra Nath Bose , based on a counting method that assumed that light could be understood as a gas of indistinguishable particles.
Einstein also published his own articles describing the model and its implications, among them the Bose—Einstein condensate phenomenon that some particulates should appear at very low temperatures.
Although the patent office promoted Einstein to Technical Examiner Second Class in , he had not given up on academia. In , he became a Privatdozent at the University of Bern.
This paper introduced the photon concept although the name photon was introduced later by Gilbert N. Lewis in and inspired the notion of wave—particle duality in quantum mechanics.
Einstein saw this wave—particle duality in radiation as concrete evidence for his conviction that physics needed a new, unified foundation.
In a series of works completed from to , Planck reformulated his quantum theory and introduced the idea of zero-point energy in his "second quantum theory".
Soon, this idea attracted the attention of Einstein and his assistant Otto Stern. Assuming the energy of rotating diatomic molecules contains zero-point energy, they then compared the theoretical specific heat of hydrogen gas with the experimental data.
The numbers matched nicely. However, after publishing the findings, they promptly withdrew their support, because they no longer had confidence in the correctness of the idea of zero-point energy.
In , at the height of his work on relativity, 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.
This paper was enormously influential in the later development of quantum mechanics, because it was the first paper to show that the statistics of atomic transitions had simple laws.
In another major paper from this era, Einstein gave a wave equation for de Broglie waves , which Einstein suggested was the Hamilton—Jacobi equation of mechanics.
Einstein was displeased with modern quantum mechanics as it had evolved after Contrary to popular belief, his doubts were not due to a conviction that God "is not playing at dice.
Einstein believed that a physical reality exists independent of our ability to observe it. In contrast, Bohr and his followers maintained that all we can know are the results of measurements and observations, and that it makes no sense to speculate about an ultimate reality that exists beyond our perceptions.
The Bohr—Einstein debates were a series of public disputes about quantum mechanics between Einstein and Niels Bohr , who were two of its founders.
Their debates are remembered because of their importance to the philosophy of science. In , Einstein returned quantum mechanics, in particular to the question of its completeness, in the "EPR paper".
No matter how far the two particles were separated, a precise position measurement on one particle would result in equally precise knowledge of the position of the other particle; likewise a precise momentum measurement of one particle would result in equally precise knowledge of the momentum of the other particle, without needing to disturb the other particle in any way.
Einstein rejected this second possibility popularly called "spooky action at a distance". Bell had delineated in The results of these and subsequent experiments demonstrate that quantum physics cannot be represented by any version of the picture of physics in which "particles are regarded as unconnected independent classical-like entities, each one being unable to communicate with the other after they have separated.
Although Einstein was wrong about local realism, his clear prediction of the unusual properties of its opposite, entangled quantum states , has resulted in the EPR paper becoming among the top ten papers published in Physical Review.
It is considered a centerpiece of the development of quantum information theory. Following his research on general relativity, Einstein entered into a series of attempts to generalize his geometric theory of gravitation to include electromagnetism as another aspect of a single entity.
In , he described his " unified field theory " in a Scientific American article titled "On the Generalized Theory of Gravitation".
In his pursuit of a unification of the fundamental forces, Einstein ignored some mainstream developments in physics, most notably the strong and weak nuclear forces , which were not well understood until many years after his death.
Einstein conducted other investigations that were unsuccessful and abandoned. These pertain to force , superconductivity , and other research.
In addition to longtime collaborators Leopold Infeld , Nathan Rosen , Peter Bergmann and others, Einstein also had some one-shot collaborations with various scientists.
Einstein and De Haas demonstrated that magnetization is due to the motion of electrons, nowadays known to be the spin.
In order to show this, they reversed the magnetization in an iron bar suspended on a torsion pendulum. This experiment needed to be sensitive, because the angular momentum associated with electrons is small, but it definitively established that electron motion of some kind is responsible for magnetization.
Then to each possible quantum motion of a particle in a box associate an independent harmonic oscillator. Quantizing these oscillators, each level will have an integer occupation number, which will be the number of particles in it.
This formulation is a form of second quantization , but it predates modern quantum mechanics. This absorption refrigerator was then revolutionary for having no moving parts and using only heat as an input.
Their invention was not immediately put into commercial production, and the most promising of their patents were acquired by the Swedish company Electrolux.
While traveling, Einstein wrote daily to his wife Elsa and adopted stepdaughters Margot and Ilse. 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 .
Einstein had expressed his interest in the plumbing profession and was made an honorary member of the Plumbers and Steamfitters Union.
Corbis , successor to The Roger Richman Agency, licenses the use of his name and associated imagery, as agent for the university. In the period before World War II, The New Yorker published a vignette in their "The Talk of the Town" feature saying that 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.
Einstein has been the subject of or inspiration for many novels, films, plays, and works of music. Many popular quotations are often misattributed to him.
Einstein received numerous awards and honors and in he 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".
None of the nominations in met the criteria set by Alfred Nobel , so the prize was carried forward and awarded to Einstein in From Wikipedia, the free encyclopedia.
For other people, see Einstein surname. For other uses, see Albert Einstein disambiguation and Einstein disambiguation. German-born physicist and developer of the theory of relativity.
Princeton, New Jersey , US. Swiss Federal Polytechnic —; B. Annus Mirabilis papers , Photoelectric effect , Special theory of relativity , Mass—energy equivalence , and Brownian motion.
Statistical mechanics , thermal fluctuations , and statistical physics. History of special relativity. History of general relativity.
Equivalence principle , Theory of relativity , and Einstein field equations. Discovery of cosmic microwave background radiation. Religious interpretations of the Big Bang theory.
Classical unified field theories. Albert Einstein in popular culture. Einstein, Albert [Manuscript received: Written at Zurich, Switzerland.
Annalen der Physik Berlin in German. Hoboken, NJ published 14 March Einstein, Albert a [Manuscript received: Written at Berne, Switzerland.
Hoboken, NJ published 10 March Einstein, Albert b [Completed 30 April and submitted 20 July ]. Written at Berne, Switzerland, published by Wyss Buchdruckerei.
Einstein, Albert c [Manuscript received: Einstein, Albert d [Manuscript received: Annalen der Physik Berlin Submitted manuscript in German.
Einstein, Albert e [Manuscript received: Einstein, Albert [Published 25 November ]. Physikalische Zeitschrift in German.
Einstein, Albert [First published , in English ]. Nobel Lectures, Physics — in German and English. Einstein, Albert [Published 10 July ].
First of a series of papers on this topic. Die Naturwissenschaften in German. Dover Publications published Physical Review Submitted manuscript.
Einstein, Albert 9 November On Science and Religion. Einstein, Albert; et al. The New York Times. Einstein, Albert May Monthly Review Foundation published May Archived from the original on 11 January Retrieved 16 January — via MonthlyReview.
Albert Einstein, Hedwig und Max Born: Briefwechsel — in German. Paul Arthur Schilpp Centennial ed. The chasing a light beam thought experiment is described on pages 48— Stachel, John ; Martin J.
Kox; Michel Janssen; R. Schulmann; Diana Komos Buchwald; et al. Xavi correctly predicted that Qatar would win the Asian Cup to the delight of coach and compatriot Felix Sanchez.
There has been speculation Qatar replace Felix Sanchez for the World Cup, but the coach is not worried about the prospect of losing his job.
Real Madrid will face defending champions Barcelona in the semi-finals of the Copa del Rey. After equalling a Serie A goals record by scoring in 11 straight games, year-old striker Fabio Quagliarella is back in the Italy squad.
With the January transfer window closing on Thursday evening, AFP Sport picks out some of the main deals to go through around Europe on deadline day.
Giannis Antetokounmpo finished with a team high 19 points and nine rebounds as the Milwaukee Bucks beat the Toronto Raptors in a showdown between the two top Eastern Conference teams.
Barcelona have announced the signing of Emerson from Atletico Mineiro but the year-old Brazilian will play for Real Betis on loan until June.
Serie A champions Juventus will only be without Giorgio Chiellini for a short stretch, according to Massimiliano Allegri. Barcelona pulled of a brilliant comeback by blowing away Sevilla on Wednesday to book their place in the semi-finals of the Copa del Rey.
Liverpool extended their lead at the top of the Premier League table to five points following a draw at home to Leicester City on Wednesday.
Garbine Muguruza trailed in the second set, but won the next five games as Mona Barthel was unable to force a decider.
Four-time defending champions Juventus crashed out of the Coppa Italia on Wednesday with a quarter-final defeat by Atalanta. Emiliano Sala disappeared on January 21 when a plane he was on vanished, but authorities believe they have found cushions from the aircraft.
France led at half-time in the driving rain in Paris, but they fell apart in the second half to start the Six Nations with a defeat.
Mauricio Pochettino plans to fulfil his Spurs contract, but he cannot guarantee that he will remain at the London club next term.
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