Edward Witten

Last updated
Edward Witten
Edward Witten.jpg
Witten in 2008
Born (1951-08-26) August 26, 1951 (age 69)
Citizenship USA
Education
Known for M-theory
Seiberg–Witten theory
Seiberg-Witten map
Seiberg–Witten invariants
Wess–Zumino–Witten model
Weinberg–Witten theorem
Gromov–Witten invariant
Hořava–Witten domain wall
Vafa–Witten theorem
Witten index
BCFW recursion
Topological quantum field theory (Witten-type TQFTs)
Topological string theory
CSW rules
Witten conjecture
Witten zeta function
Hanany–Witten transition
Twistor string theory
Chern–Simons theory
Positive energy theorem
Witten-Veneziano mechanism
Spouse(s) Chiara Nappi
Children3
Awards MacArthur Fellowship (1982)
Dirac Medal (1985)
Albert Einstein Medal (1985)
Fields Medal (1990)
Alan T. Waterman Award (1986)
Dannie Heineman Prize (1998)
Nemmers Prize (2000)
National Medal of Science (2002)
Harvey Prize (2005)
Henri Poincaré Prize (2006)
Crafoord Prize (2008)
Lorentz Medal (2010)
Isaac Newton Medal (2010)
Fundamental Physics Prize (2012)
Kyoto Prize (2014)
Albert Einstein Award (2016) [1]
Scientific career
Fields Theoretical physics
Mathematical physics
Superstring theory
Institutions Institute for Advanced Study
Harvard University
Oxford University
California Institute of Technology
Princeton University
Thesis Some Problems in the Short Distance Analysis of Gauge Theories  (1976)
Doctoral advisor David Gross [2]
Other academic advisors Sidney Coleman [3]
Michael Atiyah [3]
Doctoral students Jonathan Bagger (1983)
Cumrun Vafa (1985)
Xiao-Gang Wen (1987)
Dror Bar-Natan (1991)
Shamit Kachru (1994)
Eva Silverstein (1996)
Sergei Gukov (2001)
Website www.ias.edu/sns/witten

Edward Witten (born August 26, 1951) is an American mathematical and theoretical physicist. He is currently the Charles Simonyi Professor in the School of Natural Sciences at the Institute for Advanced Study. [4] Witten is a researcher in string theory, quantum gravity, supersymmetric quantum field theories, and other areas of mathematical physics. In addition to his contributions to physics, Witten's work has significantly impacted pure mathematics. [5] In 1990, he became the first physicist to be awarded a Fields Medal by the International Mathematical Union, awarded for his 1981 proof of the positive energy theorem in general relativity. [6] He is considered to be the practical founder of M-theory. [7]

Contents

Early life and education

Witten was born on August 26, 1951, in Baltimore, Maryland, to a Jewish family. [8] He is the son of Lorraine (née Wollach) Witten and Louis Witten, a theoretical physicist specializing in gravitation and general relativity. [9]

Witten attended the Park School of Baltimore (class of '68), and received his Bachelor of Arts degree with a major in history and minor in linguistics from Brandeis University in 1971. [10]

He had aspirations in journalism and politics and published articles in both The New Republic and The Nation in the late 1960s. [11] [12] In 1972 he worked for six months in George McGovern's presidential campaign.[ when? ] [13]

Witten attended the University of Wisconsin–Madison for one semester as an economics graduate student before dropping out. [2] He returned to academia, enrolling in applied mathematics at Princeton University in 1973, then shifting departments and receiving a Ph.D. in physics in 1976 and completing a dissertation titled "Some problems in the short distance analysis of gauge theories" under the supervision of David Gross. [14] He held a fellowship at Harvard University (1976–77), visited Oxford University (1977–78), [3] [15] was a junior fellow in the Harvard Society of Fellows (1977–1980), and held a MacArthur Foundation fellowship (1982). [4]

Research

Fields medal work

Witten was awarded the Fields Medal by the International Mathematical Union in 1990, becoming the first physicist to win the prize. [16]

In a written address to the ICM, Michael Atiyah said of Witten: [5]

"Although he is definitely a physicist (as his list of publications clearly shows) his command of mathematics is rivaled by few mathematicians, and his ability to interpret physical ideas in mathematical form is quite unique. Time and again he has surprised the mathematical community by a brilliant application of physical insight leading to new and deep mathematical theorems... He has made a profound impact on contemporary mathematics. In his hands physics is once again providing a rich source of inspiration and insight in mathematics." [5]

Edward Witten (left) with mathematician Shigefumi Mori, probably at the ICM in 1990, where they received the Fields Medal. Widden Mori.jpg
Edward Witten (left) with mathematician Shigefumi Mori, probably at the ICM in 1990, where they received the Fields Medal.

As an example of Witten's work in pure mathematics, Atiyah cites his application of techniques from quantum field theory to the mathematical subject of low-dimensional topology. In the late 1980s, Witten coined the term topological quantum field theory for a certain type of physical theory in which the expectation values of observable quantities encode information about the topology of spacetime. [17] In particular, Witten realized that a physical theory now called Chern–Simons theory could provide a framework for understanding the mathematical theory of knots and 3-manifolds. [18] Although Witten's work was based on the mathematically ill-defined notion of a Feynman path integral and was therefore not mathematically rigorous, mathematicians were able to systematically develop Witten's ideas, leading to the theory of Reshetikhin–Turaev invariants. [19]

Another result for which Witten was awarded the Fields Medal was his proof in 1981 of the positive energy theorem in general relativity. [20] This theorem asserts that (under appropriate assumptions) the total energy of a gravitating system is always positive and can be zero only if the geometry of spacetime is that of flat Minkowski space. It establishes Minkowski space as a stable ground state of the gravitational field. While the original proof of this result due to Richard Schoen and Shing-Tung Yau used variational methods, [21] [22] Witten's proof used ideas from supergravity theory to simplify the argument.[ citation needed ]

A third area mentioned in Atiyah's address is Witten's work relating supersymmetry and Morse theory, [23] a branch of mathematics that studies the topology of manifolds using the concept of a differentiable function. Witten's work gave a physical proof of a classical result, the Morse inequalities, by interpreting the theory in terms of supersymmetric quantum mechanics.[ citation needed ]

M-theory

By the mid 1990s, physicists working on string theory had developed five different consistent versions of the theory. These versions are known as type I, type IIA, type IIB, and the two flavors of heterotic string theory (SO(32) and E8×E8). The thinking was that out of these five candidate theories, only one was the actual correct theory of everything, and that theory was the one whose low-energy limit matched the physics observed in our world today.[ citation needed ]

Speaking at the string theory conference at University of Southern California in 1995, Witten made the surprising suggestion that these five string theories were in fact not distinct theories, but different limits of a single theory which he called M-theory. [24] [25] Witten's proposal was based on the observation that the five string theories can be mapped to one another by certain rules called dualities and are identified by these dualities. Witten's announcement led to a flurry of work now known as the second superstring revolution.[ citation needed ]

Other work

Edward Witten (center) with David Gross and Stephen Hawking at Strings 2001 at TIFR in Mumbai, India. Gross Witten Hawking TIFR 2001.jpg
Edward Witten (center) with David Gross and Stephen Hawking at Strings 2001 at TIFR in Mumbai, India.

Another of Witten's contributions to physics was to the result of gauge/gravity duality. In 1997, Juan Maldacena formulated a result known as the AdS/CFT correspondence, which establishes a relationship between certain quantum field theories and theories of quantum gravity. [26] Maldacena's discovery has dominated high energy theoretical physics for the past 15 years because of its applications to theoretical problems in quantum gravity and quantum field theory. Witten's foundational work following Maldacena's result has shed light on this relationship. [27]

In collaboration with Nathan Seiberg, Witten established several powerful results in quantum field theories. In their paper on string theory and noncommutative geometry, Seiberg and Witten studied certain noncommutative quantum field theories that arise as limits of string theory. [28] In another well-known paper, they studied aspects of supersymmetric gauge theory. [29] The latter paper, combined with Witten's earlier work on topological quantum field theory, [17] led to developments in the topology of smooth 4-manifolds, in particular the notion of Seiberg–Witten invariants.[ citation needed ]

With Anton Kapustin, Witten has made deep mathematical connections between S-duality of gauge theories and the geometric Langlands correspondence. [30] Partly in collaboration with Seiberg, one of his recent interests include aspects of field theoretical description of topological phases in condensed matter and non-supersymmetric dualities in field theories that, among other things, are of high relevance in condensed matter theory. From a generalization of SYK models from condensed matter and quantum chaos, he has also recently brought tensor models of Gurau to the relevance of holographic and quantum gravity theories.[ citation needed ]

In general, Witten has done influential and insightful works in many aspects of quantum field theories and mathematical physics, including the physics and mathematics of anomalies, integrability, dualities, localization, homologies and so on. Many of his results have deeply influenced many areas in theoretical physics (often well beyond the original context of his results), including string theory, quantum gravity and topological condensed matter.[ citation needed ]

Awards and honors

Witten has been honored with numerous awards including a MacArthur Grant (1982), the Fields Medal (1990), the Golden Plate Award of the American Academy of Achievement (1997), [31] the Nemmers Prize in Mathematics (2000), the National Medal of Science [32] (2002), Pythagoras Award [33] (2005), the Henri Poincaré Prize (2006), the Crafoord Prize (2008), the Lorentz Medal (2010) the Isaac Newton Medal (2010) and the Fundamental Physics Prize (2012). Since 1999, he has been a Foreign Member of the Royal Society (London), and in March 2016 was elected an Honorary Fellow of the Royal Society of Edinburgh. [34] [35] Pope Benedict XVI appointed Witten as a member of the Pontifical Academy of Sciences (2006). He also appeared in the list of TIME magazine's 100 most influential people of 2004. In 2012 he became a fellow of the American Mathematical Society. [36] Witten was elected as a member of the American Academy of Arts and Sciences in 1984 and a member of the National Academy of Sciences in 1988. [37] [38]

In an informal poll at a 1990 cosmology conference, Witten received the largest number of mentions as "the smartest living physicist". [39]

Personal life

Witten has been married to Chiara Nappi, a professor of physics at Princeton University, since 1979. [40] They have two daughters and one son. Their daughter Ilana B. Witten is a neuroscientist at Princeton University, [41] and daughter Daniela Witten is a biostatistician at the University of Washington. [42]

Witten sits on the board of directors of Americans for Peace Now and on the advisory council of J Street. [43] He supports the two-state solution and advocates a boycott of Israeli institutions and economic activity beyond its 1967 borders, though not of Israel itself. [44]

Selected publications

Related Research Articles

M-theory Framework of superstring theory

M-theory is a theory in physics that unifies all consistent versions of superstring theory. Edward Witten first conjectured the existence of such a theory at a string-theory conference at the University of Southern California in the spring of 1995. Witten's announcement initiated a flurry of research activity known as the second superstring revolution.

String theory Theoretical framework in physics

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other. On distance scales larger than the string scale, a string looks just like an ordinary particle, with its mass, charge, and other properties determined by the vibrational state of the string. In string theory, one of the many vibrational states of the string corresponds to the graviton, a quantum mechanical particle that carries gravitational force. Thus string theory is a theory of quantum gravity.

Supersymmetry Symmetry between bosons and fermions

In particle physics, supersymmetry (SUSY) is a conjectured relationship between two basic classes of elementary particles: bosons, which have an integer-valued spin, and fermions, which have a half-integer-valued spin. A type of spacetime symmetry, supersymmetry is a possible candidate for undiscovered particle physics, and seen by some physicists as an elegant solution to many current problems in particle physics if confirmed correct, which could resolve various areas where current theories are believed to be incomplete. A supersymmetrical extension to the Standard Model could resolve major hierarchy problems within gauge theory, by guaranteeing that quadratic divergences of all orders will cancel out in perturbation theory.

In theoretical physics, twistor theory was proposed by Roger Penrose in 1967 as a possible path to quantum gravity and has evolved into a branch of theoretical and mathematical physics. Penrose proposed that twistor space should be the basic arena for physics from which space-time itself should emerge. It leads to a powerful set of mathematical tools that have applications to differential and integral geometry, nonlinear differential equations and representation theory and in physics to general relativity and quantum field theory, in particular to scattering amplitudes.

S-duality

In theoretical physics, S-duality is an equivalence of two physical theories, which may be either quantum field theories or string theories. S-duality is useful for doing calculations in theoretical physics because it relates a theory in which calculations are difficult to a theory in which they are easier.

In gauge theory and mathematical physics, a topological quantum field theory is a quantum field theory which computes topological invariants.

Juan Martín Maldacena Argentine physicist

Juan Martín Maldacena is a theoretical physicist and the Carl P. Feinberg Professor in the School of Natural Sciences at the Institute for Advanced Study. He has made significant contributions to the foundations of string theory and quantum gravity. His most famous discovery is the AdS/CFT correspondence, a realization of the holographic principle in string theory.

AdS/CFT correspondence Duality between theories of gravity on anti-de Sitter space and conformal field theories

In theoretical physics, the anti-de Sitter/conformal field theory correspondence, sometimes called Maldacena duality or gauge/gravity duality, is a conjectured relationship between two kinds of physical theories. On one side are anti-de Sitter spaces (AdS) which are used in theories of quantum gravity, formulated in terms of string theory or M-theory. On the other side of the correspondence are conformal field theories (CFT) which are quantum field theories, including theories similar to the Yang–Mills theories that describe elementary particles.

Cumrun Vafa

Cumrun Vafa is an Iranian-American theoretical physicist and the Hollis Professor of Mathematics and Natural Philosophy at Harvard University.

Nathan Seiberg

Nathan "Nati" Seiberg is an Israeli American theoretical physicist who works on string theory. He is currently a professor at the Institute for Advanced Study in Princeton, New Jersey, USA.

Montonen–Olive duality

Montonen–Olive duality or electric–magnetic duality is the oldest known example of strong–weak duality or S-duality according to current terminology. It generalizes the electro-magnetic symmetry of Maxwell's equations by stating that magnetic monopoles, which are usually viewed as emergent quasiparticles that are "composite", can in fact be viewed as "elementary" quantized particles with electrons playing the reverse role of "composite" topological solitons; the viewpoints are equivalent and the situation dependent on the duality. It was later proven to hold true when dealing with a N = 4 supersymmetric Yang–Mills theory. It is named after Finnish physicist Claus Montonen and British physicist David Olive after they proposed the idea in their academic paper Magnetic monopoles as gauge particles? where they state:

There should be two "dual equivalent" field formulations of the same theory in which electric (Noether) and magnetic (topological) quantum numbers exchange roles.

<i>K</i>-theory (physics)

In string theory, K-theory classification refers to a conjectured application of K-theory to superstrings, to classify the allowed Ramond–Ramond field strengths as well as the charges of stable D-branes.

Nikita Nekrasov Mathematical and theoretical physicist

Nikita Alexandrovich Nekrasov is a mathematical and theoretical physicist at the Simons Center for Geometry and Physics and C.N.Yang Institute for Theoretical Physics at Stony Brook University in New York, and a Professor of the Russian Academy of Sciences.

Matilde Marcolli Italian mathematician and physicist

Matilde Marcolli is an Italian mathematical physicist. She has conducted research work in areas of mathematics and theoretical physics; obtained the Heinz Maier-Leibnitz-Preis of the Deutsche Forschungsgemeinschaft, and the Sofia Kovalevskaya Award of the Alexander von Humboldt Foundation. Marcolli has authored and edited numerous books in the field. She is currently a professor in the mathematics department of the University of Toronto and a member of the Perimeter Institute.

In theoretical physics, 3D mirror symmetry is a version of mirror symmetry in 3-dimensional gauge theories with N=4 supersymmetry, or 8 supercharges. It was first proposed by Kenneth Intriligator and Nathan Seiberg, in their 1996 paper "Mirror symmetry in three-dimensional gauge theories", as a relation between pairs of 3-dimensional gauge theories, such that the Coulomb branch of the moduli space of one is the Higgs branch of the moduli space of the other. It was demonstrated using D-brane cartoons by Amihay Hanany and Edward Witten 4 months later, where they found that it is a consequence of S-duality in type IIB string theory.

6D (2,0) superconformal field theory

In theoretical physics, the six-dimensional (2,0)-superconformal field theory is a quantum field theory whose existence is predicted by arguments in string theory. It is still poorly understood because there is no known description of the theory in terms of an action functional. Despite the inherent difficulty in studying this theory, it is considered to be an interesting object for a variety of reasons, both physical and mathematical.

Freddy Alexander Cachazo is a Venezuelan-born theoretical physicist who holds the Gluskin Sheff Freeman Dyson Chair in Theoretical Physics at the Perimeter Institute for Theoretical Physics in Waterloo, Ontario, Canada.

Luis Álvarez-Gaumé is a Spanish theoretical physicist who works on string theory and quantum gravity.

Claus Montonen is a Finnish theoretical physicist, most known for his work with British physicist David Olive in proposing the Montonen–Olive duality.

Michael Dine is an American theoretical physicist, specializing in elementary particle physics, supersymmetry, string theory, and physics beyond the Standard Model.

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  23. Witten, Edward (1982). "Super-symmetry and Morse Theory". Journal of Differential Geometry . 17 (4): 661–692. doi: 10.4310/jdg/1214437492 .
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  29. Seiberg, Nathan; Witten, Edward (1994). "Electric-magnetic duality, monopole condensation, and confinement in N=2 supersymmetric Yang-Mills theory". Nuclear Physics B . 426 (1): 19–52. arXiv: hep-th/9407087 . Bibcode:1994NuPhB.426...19S. doi:10.1016/0550-3213(94)90124-4. S2CID   14361074.
  30. Kapustin, Anton; Witten, Edward (2006-04-21). "Electric-Magnetic Duality And The Geometric Langlands Program". Communications in Number Theory and Physics. 1: 1–236. arXiv: hep-th/0604151 . Bibcode:2007CNTP....1....1K. doi:10.4310/CNTP.2007.v1.n1.a1. S2CID   30505126.
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    "At a 1990 conference on cosmology," wrote John Horgan in 2014, "I asked attendees, who included folks like Stephen Hawking, Michael Turner, James Peebles, Alan Guth and Andrei Linde, to nominate the smartest living physicist. Edward Witten got the most votes (with Steven Weinberg the runner-up). Some considered Witten to be in the same league as Einstein and Newton." See "Physics Titan Edward Witten Still Thinks String Theory 'on the Right Track'". scientificamerican.com. 22 September 2014. Retrieved 14 October 2014.

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