Kip Thorne

Last updated

Kip Thorne
Kip Thorne at Caltech.jpg
Thorne in August 2007
Born
Kip Stephen Thorne

(1940-06-01) June 1, 1940 (age 79)
Education California Institute of Technology (B.S.)
Princeton University (M.S., Ph.D.)
Known for Thorne-Żytkow object
Roman arch
Thorne-Hawking-Preskill bet
LIGO
Gravitational waves
Gravitation
Spouse(s)
Linda Jean Peterson
(m. 1960;div. 1977)

Carolee Joyce Winstein
(m. 1984)
Children2
Awards Lilienfeld Prize (1996)
Albert Einstein Medal (2009) [1]
Special Breakthrough Prize in Fundamental Physics (2016)
Gruber Prize in Cosmology (2016)
Shaw Prize (2016)
Kavli Prize (2016)
Harvey Prize (2016)
Princess of Asturias Award (2017)
Nobel Prize in Physics (2017)
Lewis Thomas Prize (2018)
Scientific career
Fields Astrophysics
Gravitational physics
Institutions California Institute of Technology
Thesis Geometrodynamics of cylindrical systems  (1965)
Doctoral advisor John Archibald Wheeler
Doctoral students William L. Burke [2]
Carlton M. Caves
Lee Samuel Finn
Sándor J. Kovács
David L. Lee
Alan Lightman
Don N. Page
William H. Press
Richard H. Price
Bernard F. Schutz
Saul Teukolsky
Clifford Martin Will
Kip S. Thorne during Nobel Prize press conference in Stockholm, December 2017 Kip S. Thorne EM1B8790 (24027017497).jpg
Kip S. Thorne during Nobel Prize press conference in Stockholm, December 2017

Kip Stephen Thorne (born June 1, 1940) is an American theoretical physicist and Nobel laureate, known for his contributions in gravitational physics and astrophysics. A longtime friend and colleague of Stephen Hawking and Carl Sagan, he was the Feynman Professor of Theoretical Physics at the California Institute of Technology (Caltech) until 2009 [3] and is one of the world's leading experts on the astrophysical implications of Einstein's general theory of relativity. He continues to do scientific research and scientific consulting, most notably for the Christopher Nolan film Interstellar . [4] [5]

Contents

In 2017, Thorne was awarded the Nobel Prize in Physics along with Rainer Weiss and Barry C. Barish "for decisive contributions to the LIGO detector and the observation of gravitational waves". [6] [7] [8] [9]

Life and career

Discussion in the main lecture hall at the Ecole de Physique des Houches (Les Houches Physics School), 1972. From left, Yuval Ne'eman, Bryce DeWitt, Thorne, Demetrios Christodoulou. Ecole de Physique des Houches (Les Houches Physics School) main lecture hall 1972.jpg
Discussion in the main lecture hall at the École de Physique des Houches (Les Houches Physics School), 1972. From left, Yuval Ne'eman, Bryce DeWitt, Thorne, Demetrios Christodoulou.

Thorne was born in Logan, Utah on June 1, 1940. His father was a chemist, his mother Alison (née Comish) Thorne, was an economist and the first woman to receive a Ph.D. in the discipline from Iowa State College. [10] Raised in an academic environment, two of his four siblings also became professors. [11] [12] Thorne's parents were members of The Church of Jesus Christ of Latter-day Saints (Mormons) and raised Thorne in the LDS faith, though he now describes himself as atheist. Regarding his views on science and religion, Thorne has stated: "There are large numbers of my finest colleagues who are quite devout and believe in God [...] There is no fundamental incompatibility between science and religion. I happen to not believe in God." [13]

Thorne rapidly excelled at academics early in life, winning recognition in the Westinghouse Science Talent Search as a senior at Logan High School and becoming one of the youngest full professors in the history of the California Institute of Technology at age 30. [14] He received his B.S. degree from Caltech in 1962, and Ph.D. degree from Princeton University in 1965. [15] He wrote his doctoral thesis, Geometrodynamics of Cylindrical Systems, under the supervision of John Wheeler. Thorne returned to Caltech as an associate professor in 1967 and became a professor of theoretical physics in 1970, the William R. Kenan, Jr. Professor in 1981, and the Feynman Professor of Theoretical Physics in 1991. He was an adjunct professor at the University of Utah from 1971 to 1998 and Andrew D. White Professor at Large at Cornell University from 1986 to 1992. [16] In June 2009, he resigned his Feynman Professorship (he is now the Feynman Professor of Theoretical Physics, Emeritus) to pursue a career of writing and movie making.[ citation needed ] His first film project was Interstellar , on which he worked with Christopher Nolan and Jonathan Nolan. [3]

Throughout the years, Thorne has served as a mentor and thesis advisor for many leading theorists who now work on observational, experimental, or astrophysical aspects of general relativity. Approximately 50 physicists have received Ph.D.s at Caltech under Thorne's personal mentorship. [3]

Thorne is known for his ability to convey the excitement and significance of discoveries in gravitation and astrophysics to both professional and lay audiences. In 1999, Thorne made some speculations on what the 21st century will find as the answers to the following questions: [17] [18]

His presentations on subjects such as black holes, gravitational radiation, relativity, time travel, and wormholes have been included in PBS shows in the U.S. and on the BBC in the United Kingdom.

Thorne and Linda Jean Peterson married in 1960. Their children are Kares Anne and Bret Carter, an architect. Thorne and Peterson divorced in 1977. Thorne and his second wife, Carolee Joyce Winstein, a professor of biokinesiology and physical therapy at USC, married in 1984. [19]

Research

Thorne in 1972 Kip S. Thorne, 1972.jpg
Thorne in 1972

Thorne's research has principally focused on relativistic astrophysics and gravitation physics, with emphasis on relativistic stars, black holes and especially gravitational waves. [3] He is perhaps best known to the public for his controversial theory that wormholes can conceivably be used for time travel. [20] However, Thorne's scientific contributions, which center on the general nature of space, time, and gravity, span the full range of topics in general relativity.

Gravitational waves and LIGO

Thorne's work has dealt with the prediction of gravitational wave strengths and their temporal signatures as observed on Earth. These "signatures" are of great relevance to LIGO (Laser Interferometer Gravitational Wave Observatory), a multi-institution gravitational wave experiment for which Thorne has been a leading proponent – in 1984, he cofounded the LIGO Project (the largest project ever funded by the NSF [21] ) to discern and measure any fluctuations between two or more 'static' points; such fluctuations would be evidence of gravitational waves, as calculations describe. A significant aspect of his research is developing the mathematics necessary to analyze these objects. [22] Thorne also carries out engineering design analyses for features of the LIGO that cannot be developed on the basis of experiment and he gives advice on data analysis algorithms by which the waves will be sought. He has provided theoretical support for LIGO, including identifying gravitational wave sources that LIGO should target, designing the baffles to control scattered light in the LIGO beam tubes, and – in collaboration with Vladimir Braginsky's (Moscow, Russia) research group – inventing quantum nondemolition designs for advanced gravity-wave detectors and ways to reduce the most serious kind of noise in advanced detectors: thermoelastic noise. With Carlton M. Caves, Thorne invented the back-action-evasion approach to quantum nondemolition measurements of the harmonic oscillators – a technique applicable both in gravitational wave detection and quantum optics. [3]

On February 11, 2016, a team of four physicists [lower-alpha 1] representing the LIGO Scientific Collaboration, announced that in September 2015, LIGO recorded the signature of two black holes colliding 1.3 billion light-years away. This recorded detection was the first direct observation of the fleeting chirp of a gravitational wave and confirmed an important prediction of Einstein's general theory of relativity. [23] [24] [25] [26] [27]

Black hole cosmology

A cylindrical bundle of magnetic field lines Cylindrical Bundle of Magnetic Field Lines.svg
A cylindrical bundle of magnetic field lines

While he was studying for his Ph.D. in Princeton University, his mentor John Wheeler gave him an assignment problem for him to think over: find out whether or not a cylindrical bundle of repulsive magnetic field lines will implode under its own attractive gravitational force. After several months wrestling with the problem, he proved that it was impossible for cylindrical magnetic field lines to implode. [28] :262–265

Why is it that a cylindrical bundle of magnetic field lines will not implode, while spherical stars will implode under their own gravitational force? Thorne tried to explore the theoretical ridge between the two phenomena. He found out eventually that the gravitational force can overcome all interior pressure only when an object has been compressed in all directions. To express this realization, Thorne proposed his hoop conjecture, which describes an imploding star turning into a black hole when the critical circumference of the designed hoop can be placed around it and set into rotation. That is, any object of mass M around which a hoop of circumference can be spun must be a black hole. [28] :266–267 [29] :189–190

As a tool to be used in both enterprises, astrophysics and theoretical physics, Thorne and his students have developed an unusual approach, called the "membrane paradigm", to the theory of black holes and used it to clarify the "Blandford-Znajek" mechanism by which black holes may power some quasars and active galactic nuclei. [28] :405–411

Thorne has investigated the quantum statistical mechanical origin of the entropy of a black hole. With his postdoc Wojciech Zurek, he showed that the entropy of a black hole is the logarithm of the number of ways that the hole could have been made. [28] :445–446

With Igor Novikov and Don Page, he developed the general relativistic theory of thin accretion disks around black holes, and using this theory he deduced that with a doubling of its mass by such accretion a black hole will be spun up to 0.998 of the maximum spin allowed by general relativity, but not any farther. This is probably the maximum black-hole spin allowed in nature. [3]

Wormholes and time travel

A wormhole is a short cut connecting two separate regions in space. In the figure the green line shows the short way through wormhole, and the red line shows the long way through normal space. Wormhole-demo.png
A wormhole is a short cut connecting two separate regions in space. In the figure the green line shows the short way through wormhole, and the red line shows the long way through normal space.

Thorne and his co-workers at Caltech conducted scientific research on whether the laws of physics permit space and time to be multiply connected (can there exist classical, traversable wormholes and "time machines"?). [30] With Sung-Won Kim, Thorne identified a universal physical mechanism (the explosive growth of vacuum polarization of quantum fields), that may always prevent spacetime from developing closed timelike curves (i.e., prevent backward time travel). [31]

With Mike Morris and Ulvi Yurtsever, he showed that traversable wormholes can exist in the structure of spacetime only if they are threaded by quantum fields in quantum states that violate the averaged null energy condition (i.e. have negative renormalized energy spread over a sufficiently large region). [32] This has triggered research to explore the ability of quantum fields to possess such extended negative energy. Recent calculations by Thorne indicate that simple masses passing through traversable wormholes could never engender paradoxes – there are no initial conditions that lead to paradox once time travel is introduced. If his results can be generalized, they would suggest that none of the supposed paradoxes formulated in time travel stories can actually be formulated at a precise physical level: that is, that any situation in a time travel story turns out to permit many consistent solutions.[ citation needed ]

Relativistic stars, multipole moments and other endeavors

With Anna Żytkow, Thorne predicted the existence of red supergiant stars with neutron-star cores (Thorne–Żytkow objects). [33] He laid the foundations for the theory of pulsations of relativistic stars and the gravitational radiation they emit. With James Hartle, Thorne derived from general relativity the laws of motion and precession of black holes and other relativistic bodies, including the influence of the coupling of their multipole moments to the spacetime curvature of nearby objects, [34] as well as writing down the Hartle-Thorne metric, an approximate solution which describes the exterior of a slowly and rigidly rotating, stationary and axially symmetric body.

Thorne has also theoretically predicted the existence of universally antigravitating "exotic matter" – the element needed to accelerate the expansion rate of the universe, keep traversable wormhole "Star Gates" open and keep timelike geodesic free float "warp drives" working. With Clifford Will [35] and others of his students, he laid the foundations for the theoretical interpretation of experimental tests of relativistic theories of gravity – foundations on which Will and others then built. As of 2005, Thorne was interested in the origin of classical space and time from the quantum foam of quantum gravity theory.[ citation needed ]

Publications

Thorne has written and edited books on topics in gravitational theory and high-energy astrophysics. In 1973, he co-authored the textbook Gravitation with Charles Misner and John Wheeler; [36] that according to John C. Baez and Chris Hillman, is one of the great scientific books of all time and has inspired two generations of students. [37] In 1994, he published Black Holes and Time Warps: Einstein's Outrageous Legacy , a book for non-scientists for which he received numerous awards. This book has been published in six languages, and editions in Chinese, Italian, Czech, and Polish are in press.[ when? ] In 2014, Thorne published The Science of Interstellar in which he explains the science behind Christopher Nolan's film Interstellar; Nolan wrote the foreword to the book. In September 2017, Thorne and Roger D. Blandford published Modern Classical Physics: Optics, Fluids, Plasmas, Elasticity, Relativity, and Statistical Physics, a graduate-level textbook covering the six major areas of physics listed in the title. [38]

Thorne's articles has appeared in publications such as:

Thorne has published more than 150 articles in scholarly journals.[ citation needed ]

Honors and awards

Thorne has been elected to: [42]

He has been recognized by numerous awards including:

He has been a Woodrow Wilson Fellow, Danforth Fellow, Guggenheim Fellow, and Fulbright Fellow. He has also received the honorary degree of doctor of humane letters from Claremont Graduate University and an honorary doctorate from the Physics Department of the Aristotle University of Thessaloniki.

He was elected to hold the Lorentz chair for the year 2009 Leiden University, the Netherlands.

Thorne has served on:

Kip Thorne was selected by Time magazine in an annual list of the 100 most influential people in the American world in 2016. [51]

Adaptation in media

Partial bibliography

See also

Notes

  1. The announcement team were Thorne, David Reitze, Gabriela González, Rainer Weiss, and France A. Córdova.

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