Julian Schwinger, winner of the 1965Nobel Prize in Physics. Original caption: "His laboratory is his ballpoint pen."
Julian Seymour Schwinger (/ˈʃwɪŋər/; February 12, 1918 – July 16, 1994) was aNobel Prize-winning Americantheoretical physicist. He is best known for his work onquantum electrodynamics (QED), in particular for developing a relativistically invariantperturbation theory, and for renormalizing QED to one loop order. Schwinger was a physics professor at several universities.
Schwinger is recognized as an important physicist, responsible for much of modern quantum field theory, including avariational approach, and the equations of motion for quantum fields. He developed the firstelectroweak model, and the first example of confinement in 1+1 dimensions. He is responsible for the theory of multiple neutrinos, Schwinger terms, and the theory of the spin-3/2 field.
Julian Seymour Schwinger was born in New York City, toAshkenazi Jewish parents, Belle (née Rosenfeld) and Benjamin Schwinger, a garment manufacturer,[1] who had emigrated fromPoland to the United States. Both his father and his mother's parents were prosperous clothing manufacturers, although the family business declined after theWall Street Crash of 1929. The family followed theOrthodox Jewish tradition. Julian's older brother Harold Schwinger was born in 1911, seven years before Julian who was born in 1918.[2]
Schwinger was a precocious student. He attended theTownsend Harris High School from 1932 to 1934, a highly regarded high school for gifted students at the time. During high school, Julian had already started readingPhysical Review papers by authors such asPaul Dirac in the library of theCity College of New York, in whose campus Townsend Harris was then located.[3]
In the fall of 1934, Schwinger entered the City College of New York as an undergraduate. CCNY automatically accepted all Townsend Harris graduates at the time, and both institutions offered free tuition. Due to his intense interest in physics and mathematics, Julian performed very well in those subjects despite often skipping classes and learning directly from books. On the other hand, his lack of interest for other topics such as English led to academic conflicts with teachers of those subjects.[4]
After Julian had joined CCNY, his brother Harold, who had previously graduated from CCNY, asked his ex-classmateLloyd Motz to "get to know [Julian]". Lloyd was a CCNY physics instructor and Ph.D. candidate atColumbia University at the time. Lloyd made the acquaintance, and soon recognized Julian's talent. Noticing Schwinger's academic problems, Lloyd decided to askIsidor Isaac Rabi who he knew at Columbia for help. Rabi also immediately recognized Schwinger's capabilities on their first meeting, and then made arrangements to award Schwinger with a scholarship to study at Columbia. At first Julian's bad grades in some subjects at CCNY prevented the scholarship award. But Rabi persisted and showed an unpublished paper onquantum electrodynamics written by Schwinger toHans Bethe, who happened to be passing by New York. Bethe's approval of the paper and his reputation in that domain were then enough to secure the scholarship for Julian, who then transferred to Columbia. His academic situation at Columbia was much better than at CCNY. He was accepted into thePhi Beta Kappa society and received his B.A. in 1936.[5]
During Schwinger's graduate studies, Rabi felt that it would be good for Julian to visit other institutions around the country, and Julian was awarded a travelling fellowship for the year 37/38 which he spent at working withGregory Breit andEugene Wigner. During this time, Schwinger, who previously had already had the habit of working until late at night, went further and made the day/night switch more complete, working at night and sleeping during the day, a habit he would carry throughout his career. Schwinger later commented that this switch was in part a way to retain greater intellectual independence and avoid being "dominated" by Breit and Wigner by simply reducing the duration of contact with them by working different hours.[6]
Schwinger obtained his PhD overseen by Rabi in 1939 at the age of 21.
After having worked with Oppenheimer, Schwinger's first regular academic appointment was atPurdue University in 1941. While on leave from Purdue, he worked at theMIT Radiation Laboratory instead of at theLos Alamos National Laboratory during World War II. He provided theoretical support for the development ofradar. After the war, Schwinger left Purdue forHarvard University, where he taught from 1945 to 1974. In 1966 he became the Eugene Higgins professor of physics at Harvard.
Schwinger developed an affinity forGreen's functions from his radar work, and he used these methods to formulate quantum field theory in terms of local Green's functions in a relativistically invariant way. This allowed him to calculate unambiguously the first corrections to the electron magnetic moment in quantum electrodynamics. Earlier non-covariant work had arrived at infinite answers, but the extra symmetry in his methods allowed Schwinger to isolate the correct finite corrections.
In the same era, he introduced non-perturbative methods into quantum field theory, by calculating the rate at whichelectron–positron pairs are created bytunneling in an electric field, a process now known as the "Schwinger effect." This effect could not be seen in any finite order in perturbation theory.
Schwinger's foundational work on quantum field theory constructed the modern framework of field correlation functions and theirequations of motion. His approach started with aquantum action and allowed bosons and fermions to be treated equally for the first time, using a differential form ofGrassman integration. He gave elegant proofs for thespin-statistics theorem and theCPT theorem, and noted that the field algebra led to anomalous Schwinger terms in various classical identities, because of short distance singularities. These were foundational results in field theory, instrumental for the proper understanding ofanomalies.
In other notable early work, Rarita and Schwinger formulated the abstractPauli andFierz theory of the spin-3/2 field in a concrete form, as a vector of Dirac spinors,Rarita–Schwinger equation. In order for the spin-3/2 field to interact consistently, some form ofsupersymmetry is required, and Schwinger later regretted that he had not followed up on this work far enough to discover supersymmetry.
Schwinger discovered thatneutrinos come in multiple varieties, one for theelectron and one for themuon. Nowadays there are known to be three light neutrinos; the third is the partner of thetau lepton.
In the 1960s, Schwinger formulated and analyzed what is now known as theSchwinger model, quantum electrodynamics in one space and one time dimension, the first example of aconfining theory. He was also the first to suggest an electroweak gauge theory, an gauge group spontaneously broken to electromagnetic at long distances. This was extended by his studentSheldon Glashow into the accepted pattern of electroweak unification. He attempted to formulate a theory of quantum electrodynamics with pointmagnetic monopoles, a program which met with limited success because monopoles are strongly interacting when the quantum of charge is small.
Schwinger had a mixed relationship with his colleagues, because he always pursued independent research, different from mainstream fashion. In particular, Schwinger developed thesource theory,[9] a phenomenological theory for the physics of elementary particles, which is a predecessor of the moderneffective field theory. It treats quantum fields as long-distance phenomena and uses auxiliary 'sources' that resemble currents in classical field theories. The source theory is a mathematically consistent field theory with clearly derived phenomenological results. The criticisms by his Harvard colleagues led Schwinger to leave the faculty in 1972 forUCLA. It is a story widely told thatSteven Weinberg, who inherited Schwinger's paneled office inLyman Laboratory, there found a pair of old shoes, with theimplied message, "think you can fill these?"[10][11] Based on Schwinger's source theory, Weinberg set the underpinnings of the effective field theory, that is more appreciated among physicists. In spite of the shoes incident, Weinberg gave the credit to Schwinger for the inspiration.[12]
At UCLA, and for the rest of his career, Schwinger continued to develop the source theory and its various applications. After 1989 Schwinger took a keen interest in the non-mainstream research ofcold fusion. He wrote eight theory papers about it. He resigned from theAmerican Physical Society after their refusal to publish his papers.[13] He felt that cold fusion research was being suppressed and academic freedom violated. He wrote, "The pressure for conformity is enormous. I have experienced it in editors' rejection of submitted papers, based on venomous criticism of anonymous referees. The replacement of impartial reviewing by censorship will be the death of science."
In his last publications, Schwinger proposed a theory ofsonoluminescence as a long-distance quantum radiative phenomenon associated not with atoms, but with fast-moving surfaces in the collapsing bubble, where there are discontinuities in the dielectric constant. Themechanism of sonoluminescence now supported by experiments focuses on superheated gas inside the bubble as the source of the light.[14]
As a famous physicist, Schwinger was often compared to another legendary physicist of his generation,Richard Feynman. Schwinger was more formally inclined and favored symbolic manipulations inquantum field theory. He worked with local field operators, and found relations between them, and he felt that physicists should understand the algebra of local fields, no matter how paradoxical it was. By contrast, Feynman was more intuitive, believing that the physics could be extracted entirely from theFeynman diagrams, which gave a particle picture. Schwinger commented on Feynman diagrams in the following way,
Like the silicon chips of more recent years, the Feynman diagram was bringing computation to the masses.[16][17]
Schwinger disliked Feynman diagrams because he felt that they made the student focus on the particles and forget about local fields, which in his view inhibited understanding. He went so far as to ban them altogether from his class, although he understood them perfectly well. The true difference is however deeper, and it was expressed by Schwinger in the following passage,
Eventually, these ideas led to Lagrangian or action formulations of quantum mechanics, appearing in two distinct but related forms, which I distinguish asdifferential and integral. The latter, spearheaded by Feynman has had all the press coverage, but I continue to believe that the differential viewpoint is more general, more elegant, more useful.[18]
Despite sharing the Nobel Prize, Schwinger and Feynman had a different approach to quantum electrodynamics and to quantum field theory in general. Feynman used aregulator, while Schwinger was able to formally renormalize to one loop without an explicit regulator. Schwinger believed in the formalism of local fields, while Feynman had faith in the particle paths. They followed each other's work closely, and each respected the other. On Feynman's death, Schwinger described him as
An honest man, the outstanding intuitionist of our age, and a prime example of what may lie in store for anyone who dares to follow the beat of a different drum.[19]
^Schwinger, J. (1983) "Renormalization Theory of Quantum Electrodynamics: An Individual View", inThe Birth of Particle Physics, Cambridge University Press, p. 329.ISBN0521240050
^Schwinger, J. (1973). "A report on quantum electrodynamics". In J. Mehra (ed.),The Physicist's Conception of Nature. Dordrecht: Reidel.ISBN978-94-010-2602-4
^Beaty, Bill."Dr. Richard P. Feynman (1918–1988)". amasci.com.Archived from the original on May 7, 2007. RetrievedMay 21, 2007.; "A Path to Quantum Electrodynamics," Physics Today, February 1989
Mehra, Jagdish, and Milton, Kimball A. (2000)Climbing the Mountain: the scientific biography of Julian Schwinger. Oxford University Press.
Milton, Kimball (2007). "Julian Schwinger: Nuclear Physics, the Radiation Laboratory, Renormalized QED, Source Theory, and Beyond".Physics in Perspective.9 (1):70–114.arXiv:physics/0610054.Bibcode:2007PhP.....9...70M.doi:10.1007/s00016-007-0326-6.S2CID684471. Revised version published as (2007) "Julian Schwinger: From Nuclear Physics and Quantum Electrodynamics to Source Theory and Beyond,"Physics in Perspective9: 70–114.
Ng, Y. Jack, ed. (1996)Julian Schwinger: The Physicist, the Teacher, and the Man. Singapore: World Scientific.ISBN981-02-2531-8.
Julian Seymour Schwinger (2000), Kimball A. Milton (ed.),A quantum legacy: seminal papers of Julian Schwinger, World Scientific series in 20th century physics, vol. 26, World Scientific,Bibcode:2000qlsp.book.....K,ISBN978-981-02-4006-6
