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Leonard Susskind

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Leonard Susskind
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Leonard Susskind ({{IPAc-en|ˈ|s|ʌ|s|k|ɪ|n|d}}; born 1940)WEB, May 20–21, 2000,weblink Lennyfest, :, his 60th birthday was celebrated with a special symposium at Stanford University.WEB, June 26, 2013,weblink Why is Time a One-Way Street?, :, in Geoffrey West's introduction, he gives Suskind's current age as 74 and says his birthday was recent. is an American physicist, who is professor of theoretical physics at Stanford University, and founding director of the Stanford Institute for Theoretical Physics. His research interests include string theory, quantum field theory, quantum statistical mechanics and quantum cosmology.JOURNAL,weblink Faculty information sheet, Stanford University, 2009-09-01, He is a member of the US National Academy of Sciences,JOURNAL,weblink May 2, 2000, 60 New Members Chosen by Academy, National Academy of Sciences (press release), 2009-09-01, and the American Academy of Arts and Sciences, an associate member of the faculty of Canada's Perimeter Institute for Theoretical Physics,NEWS,weblink Leonard Susskind Joins PI, October 15, 2007, and a distinguished professor of the Korea Institute for Advanced Study.WEB,weblink Korea Institute for Advanced Study, Susskind, Leonard: Distinguished Professor / School of Physics: Theoretical Particle Physics, Susskind is widely regarded as one of the fathers of string theory.WEB,weblink NYAS Publications, Father of String Theory Muses on the Megaverse, He was the first to give a precise string-theoretic interpretation of the holographic principle in 1995JOURNAL, The World as a Hologram, Susskind, Leonard, 10.1063/1.531249, 1995, Journal of Mathematical Physics, 36, 11, 6377–6396, hep-th/9409089, 1995JMP....36.6377S, and the first to introduce the idea of the string theory landscape in 2003.ARXIV, hep-th/0302219, Leonard Susskind, The Anthropic Landscape of String Theory, 2003, JOURNAL, Byrne, P., 10.1038/scientificamerican0711-80, Bad Boy of Physics, Scientific American, 305, 1, 80–83, 2011,weblink 2011SciAm.305f..80B, Susskind was awarded the 1998 J. J. Sakurai Prize, and the 2018 Oskar Klein MedalWEB,weblink The Oskar Klein Memorial Lecture, .

Early life and education

Leonard Susskind was born to a Jewish family from the South Bronx in New York City.NEWS,weblink Leonard Susskind discusses duel with Stephen Hawking, Los Angeles Times, July 26, 2008, Jr, John Johnson, He began working as a plumber at the age of 16, taking over from his father who had become ill. Later, he enrolled in the City College of New York as an engineering student, graduating with a B.S. in physics in 1962. In an interview in the Los Angeles Times, Susskind recalls the moment he discussed with his father that changed his career path: "When I told my father I wanted to be a physicist, he said, 'Hell no, you ain’t going to work in a drug store.' I said, 'No, not a pharmacist.' I said, 'Like Einstein.' He poked me in the chest with a piece of plumbing pipe. 'You ain’t going to be no engineer,' he said. 'You're going to be Einstein.'" Susskind then studied at Cornell University under Peter A. Carruthers where he earned his Ph.D. in 1965.

Career

File:Susskind_at_cornell.jpg|thumb|right|Susskind giving 2014 Messenger Lecture at Cornell.]]Susskind was an assistant professor of physics, then an associate professor at Yeshiva University (1966–1970), after which he went for a year to the Tel Aviv University (1971–72), returning to Yeshiva to become a professor of physics (1970–1979). Since 1979 he has been professor of physics at Stanford University, and since 2000 has held the Felix Bloch professorship of physics.Susskind was awarded the 1998 J. J. Sakurai Prize for his "pioneering contributions to hadronic string models, lattice gauge theories, quantum chromodynamics, and dynamical symmetry breaking." Susskind's hallmark, according to colleagues, has been the application of "brilliant imagination and originality to the theoretical study of the nature of the elementary particles and forces that make up the physical world."PRESS RELEASE,weblink Susskind wins prestigious Sakurai Prize in theoretical physics, Stanford University, David F., Salisbury, 11 May 1997, In 2007, Susskind joined the faculty of Perimeter Institute for Theoretical Physics in Waterloo, Ontario, Canada, as an associate member. He has been elected to the National Academy of Sciences and the American Academy of Arts and Sciences. He is also a distinguished professor at Korea Institute for Advanced Study.Welcome To Kias {{webarchive |url=https://web.archive.org/web/20071105002440weblink |date=2007-11-05 }}

Scientific career

Susskind was one of at least three physicists, alongside Yoichiro Nambu and Holger Bech Nielsen, who independently discovered during or around 1970 that the Veneziano dual resonance model of strong interactions could be described by a quantum mechanical model of oscillating strings,ARXIV, hep-th/0007118, Schwarz, String Theory: The Early Years, 2000, and was the first to propose the idea of the string theory landscape. Susskind has also made important contributions in the following areas of physics:
  • The independent discovery of the string theory model of particle physicsJOURNAL, Susskind, L, 1969, Structure of hadrons implied by duality, Physical Review D, 1, 4, 1182–1186, 10.1103/physrevd.1.1182, 1970PhRvD...1.1182S,
  • The theory of quark confinementJOURNAL, Susskind, L., Leonard Susskind, Lattice models of quark confinement at high temperature, 10.1103/PhysRevD.20.2610, Physical Review D, 20, 10, 2610–2618, 1979, 1979PhRvD..20.2610S,
  • The development of Hamiltonian lattice gauge theory known as Kogut-Susskind fermionsJOURNAL, Kogut, John, Susskind, Leonard, Leonard Susskind, 10.1103/PhysRevD.11.395, Hamiltonian formulation of Wilson's lattice gauge theories, Physical Review D, 11, 2, 395, 1975, 1975PhRvD..11..395K,
  • The theory of scaling violations in deep inelastic electroproduction
  • The theory of symmetry breaking sometimes known as "technicolor theory"JOURNAL, Yao, W. -M., 10.1088/0954-3899/33/1/001, Review of Particle Physics, (Journal of Physics G: Nuclear and Particle Physics), 33, 1, 1–1232, 2006, astro-ph/0601168, 2006JPhG...33....1Y,
  • Dynamical Electroweak Symmetry Breaking section cites two 1979 publications, one by Steven Weinberg, the other by L. Susskind to represent the earliest models with technicolor and technifermions. weblink
  • The second, yet independent, theory of cosmological baryogenesisBiography, American Physical Society website (last accessed November, 2013) (Andrei Sakharov's work was first, but was mostly unknown in the Western hemisphere)
  • String theory of black hole entropyARXIV, hep-th/9309145, Leonard Susskind, Some Speculations about Black Hole Entropy in String Theory, 1993,
  • The principle of black hole complementarityJOURNAL, Susskind, L., Leonard Susskind, String theory and the principle of black hole complementarity, 10.1103/PhysRevLett.71.2367, Physical Review Letters, 71, 15, 2367–2368, 1993, 10054662, hep-th/9307168, 1993PhRvL..71.2367S,
  • The causal patch hypothesis
  • The holographic principleJOURNAL, Bousso, R., Raphael Bousso, The holographic principle, 10.1103/RevModPhys.74.825, Reviews of Modern Physics, 74, 3, 825–874, 2002, hep-th/0203101, 2002RvMP...74..825B, M-theory, including development of the {{abbr|BFSS|Banks, Fischler, Shenker, and Susskind}} matrix model JOURNAL, Banks, T., Fischler, W., Shenker, S. H., Susskind, L., M theory as a matrix model: A conjecture, 10.1103/PhysRevD.55.5112, Physical Review D, 55, 8, 5112–5128, 1997, hep-th/9610043, 1997PhRvD..55.5112B, 10.1.1.268.5260,
  • Introduction of holographic entropy bounds in physical cosmology
  • The idea of an anthropic string theory landscape
  • The Census Taker's Hat (FRW/CFT duality)
  • Most recently, application of ideas from information and computation theory, such as quantum complexity, to the physics and thermodynamics of black holes, and holographic theories in general.

Books

Susskind is the author of several popular science books.

The Cosmic Landscape

The Cosmic Landscape: String Theory and the Illusion of Intelligent Design is Susskind's first popular science book, published by Little, Brown and Company on December 12, 2005.BOOK, L. Susskind, The Cosmic Landscape: String Theory and the Illusion of Intelligent Design, Little, Brown, 2005, 978-0-316-15579-3, registration,weblink weblink It is Susskind's attempt to bring his idea of the anthropic landscape of string theory to the general public. In the book, Susskind describes how the string theory landscape was an almost inevitable consequence of several factors, one of which was Steven Weinberg's prediction of the cosmological constant in 1987. The question addressed here is why our universe is fine-tuned for our existence. Susskind explains that Weinberg calculated that if the cosmological constant was just a little different, our universe would cease to exist.

The Black Hole War

The Black Hole War: My Battle with Stephen Hawking to Make the World Safe for Quantum Mechanics is Susskind's second popular science book, published by Little, Brown, and Company on July 7, 2008.BOOK, L. Susskind, The Black Hole War: My battle with Stephen Hawking to make the world safe for quantum mechanics, Little, Brown, 2008, 978-0-316-01640-7, weblink The book is his most famous work and explains what he thinks would happen to the information and matter stored in a black hole when it evaporates. The book sparked from a debate that started in 1981, when there was a meeting of physicists to try to decode some of the mysteries about how particles of particular elemental compounds function. During this discussion Stephen Hawking stated that the information inside a black hole is lost forever as the black hole evaporates. It took 28 years for Leonard Susskind to formulate his theory that would prove Hawking wrong. He then published his theory in his book, The Black Hole War. Like The Cosmic Landscape, The Black Hole War is aimed at the lay reader. He writes: "The real tools for understanding the quantum universe are abstract mathematics: infinite dimensional Hilbert spaces, projection operators, unitary matrices and a lot of other advanced principles that take a few years to learn. But let's see how we do in just a few pages".

The Theoretical Minimum book series

Susskind co-authored a series of companion books to his lecture series The Theoretical Minimum. The first of these, (The Theoretical Minimum|The Theoretical Minimum: What You Need to Know to Start Doing Physics)BOOK, Susskind, Leonard, Hrabovsky, George, The Theoretical Minimum: What You Need to Know to Start Doing Physics, Basic Books, 2013, 978-0-465-02811-5, , was published in 2013 and presents the modern formulations of classical mechanics. The second of these, Quantum Mechanics: The Theoretical Minimum,BOOK, Susskind, Leonard, Friedman, Art, Quantum Mechanics: The Theoretical Minimum, Basic Books, 2014, 978-0-465-03667-7, was published in February 2014. The third book, Special Relativity and Classical Field Theory: The Theoretical Minimum (September 26, 2017),BOOK, Susskind, Leonard, Friedman, Art, Special Relativity and Classical Field Theory: The Theoretical Minimum, Basic Books, 2017, 978-0465093342, introduces readers to Einstein's special relativity and Maxwell's classical field theory.

The Theoretical Minimum lecture series

Susskind teaches a series of Stanford Continuing Studies courses about modern physics referred to as The Theoretical Minimum. The title of the series is a clear reference to the Landau's famous comprehensive exam called the "Theoretical Minimum" which students were expected to pass before admission to his school. The Theoretical Minimum lectures later formed the basis for the books of the same name.NEWS, Gribbin, John, Physics Made (Almost) Easy,weblink 4 June 2014, Wall Street Journal, 1 February 2013, The goal of the courses is to teach the basic but rigorous theoretical foundations required to study certain areas of physics. The sequence covers classical mechanics, relativity, quantum mechanics, statistical mechanics, and cosmology, including the physics of black holes.WEB, The Theoretical Minimum,weblink theoreticalminimum.com, 3 June 2014, These courses are available on The Theoretical Minimum website, on iTunes, and on YouTube. The courses are intended for the mathematically literateWEB,weblink Physics: Inside utter strangeness, 2014-02-26, public as well as physical science/mathematics students. Susskind aims the courses at people with prior exposure to algebra, and calculus.WEB, The Theoretical Minimum,weblink 12 June 2014, The courses are specifically aimed at people who know, or once knew, a bit of algebra and calculus, but are more or less beginners., Homework and study outside of class is otherwise unnecessary. Susskind explains most of the mathematics used, which form the basis of the lectures.

Cornell Messenger Lectures

Susskind gave 3 lectures "The Birth of the Universe and the Origin of Laws of Physics" April 28-May 1, 2014 in the Cornell Messenger Lecture series which are posted on a Cornell website.WEB, The Birth of the Universe and the Origin of Laws of Physics - CornellCast,weblink CornellCast, 2015-12-26,

Smolin–Susskind debate

The Smolin–Susskind debate refers to the series of intense postings in 2004 between Lee Smolin and Susskind, concerning Smolin’s argument that the "anthropic principle cannot yield any falsifiable predictions, and therefore cannot be a part of science."JOURNAL,weblink Smolin vs. Susskind: The Anthropic Principle, Edge Institute, August 2004, 2009-09-01, It began on July 26, 2004, with Smolin's publication of "Scientific alternatives to the anthropic principle." Smolin e-mailed Susskind asking for a comment. Having not had the chance to read the paper, Susskind requested a summarization of his arguments. Smolin obliged, and on July 28, 2004, Susskind responded, saying that the logic Smolin followed "can lead to ridiculous conclusions." The next day, Smolin responded, saying that "If a large body of our colleagues feels comfortable believing a theory that cannot be proved wrong, then the progress of science could get stuck, leading to a situation in which false, but unfalsifiable theories dominate the attention of our field." This was followed by another paper by Susskind which made a few comments about Smolin's theory of "cosmic natural selection."WEB,weblink Letter from Leonard Susskind, 2009-06-24, bot: unknown,weblink" title="web.archive.org/web/20121021175504weblink">weblink October 21, 2012, The Smolin-Susskind debate finally ended with each of them agreeing to write a final letter which would be posted on the edge.org website, with three conditions attached: (1) No more than one letter each; (2) Neither sees the other's letter in advance; (3) No changes after the fact.

Personal life

He has been married twice, first in 1960,www.edge.org • Leonard Susskind - A Biography (last accessed August 12, 2007). and has four children. Susskind is a great-grandfather.NEWS, The man who proved Stephen Hawking wrong,weblink 16 October 2016, Telegraph.co.uk,

See also

References

{{reflist|colwidth=30em}}

Further reading

  • Chown, Marcus, "Our world may be a giant hologram", New Scientist, 15 January 2009, issue 2691: "The holograms you find on credit cards and banknotes are etched on two-dimensional plastic films. When light bounces off them, it recreates the appearance of a 3D image. In the 1990s physicists Leonard Susskind and Nobel prize winner Gerard 't Hooft suggested that the same principle might apply to the universe as a whole. Our everyday experience might itself be a holographic projection of physical processes that take place on a distant, 2D surface."

External links

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