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International Society On General Relativity And Gravitation
The International Society on General Relativity and Gravitation (ISGRG) is a learned society established in 1971 with the goal to promote research on general relativity (GR) and gravitation. To that end, it encourages communication between relativity researchers, in particular by organizing the triennial international GR conferences, sponsoring the Hyperspace website, and publishing the journal ''General Relativity and Gravitation''. The society also serves as the Affiliated Commission 2 (AC.2) of the International Union of Pure and Applied Physics. The society's president is always a prominent gravitational physicist. In the past, the office has been held by Christian Møller (1971–74), Nathan Rosen (1974–77), Peter Bergmann (1977–80), Yvonne Choquet-Bruhat (1980–83), Dennis Sciama (1983–86), Ezra Ted Newman (1986–89), George Ellis (1989–92), Roger Penrose (1992–95), Jürgen Ehlers (1995–98), Werner Israel (1998–2001), Robert Wald (2001–04), Clifford Will (20 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Relativity
General relativity, also known as the general theory of relativity and Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics. General relativity generalizes special relativity and refines Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time or four-dimensional spacetime. In particular, the ' is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations, a system of second order partial differential equations. Newton's law of universal gravitation, which describes classical gravity, can be seen as a prediction of general relativity for the almost flat spacetime geometry around stationary mass distributions. Some predictions of general relativity, however, are beyond Newton's law of universal gravitat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jürgen Ehlers
Jürgen Ehlers (; 29 December 1929 – 20 May 2008) was a German physicist who contributed to the understanding of Albert Einstein's theory of general relativity. From graduate and postgraduate work in Pascual Jordan's relativity research group at Hamburg University, he held various posts as a lecturer and, later, as a professor before joining the Max Planck Institute for Astrophysics in Munich as a director. In 1995, he became the founding director of the newly created Max Planck Institute for Gravitational Physics in Potsdam, Germany. Ehlers' research focused on the foundations of general relativity as well as on the theory's applications to astrophysics. He formulated a suitable classification of exact solutions to Einstein's field equations and proved the Ehlers–Geren–Sachs theorem that justifies the application of simple, general-relativistic model universes to modern cosmology. He created a spacetime-oriented description of gravitational lensing and clarified the rel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Scientific Organizations
International is an adjective (also used as a noun) meaning "between nations". International may also refer to: Music Albums * ''International'' (Kevin Michael album), 2011 * ''International'' (New Order album), 2002 * ''International'' (The Three Degrees album), 1975 *''International'', 2018 album by L'Algérino Songs * The Internationale, the left-wing anthem * "International" (Chase & Status song), 2014 * "International", by Adventures in Stereo from ''Monomania'', 2000 * "International", by Brass Construction from ''Renegades'', 1984 * "International", by Thomas Leer from ''The Scale of Ten'', 1985 * "International", by Kevin Michael from ''International'' (Kevin Michael album), 2011 * "International", by McGuinness Flint from ''McGuinness Flint'', 1970 * "International", by Orchestral Manoeuvres in the Dark from '' Dazzle Ships'', 1983 * "International (Serious)", by Estelle from '' All of Me'', 2012 Politics * Political international, any transnational organization of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nils Andersson (mathematician)
Nils Andersson may refer to: * Nils Andersson (footballer) (1887–1947), Swedish footballer * Nils Andersson (ice hockey) (born 1991), Swedish ice hockey player * Nils Andersson (painter) (1817–1865), Swedish painter * Nils Andersson (swimmer) (1889–1973), Swedish swimmer * Nils Johan Andersson (1821–1880), Swedish botanist and traveller {{hndis, Andersson, Nils ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eric Poisson
Eric Poisson (born July 26, 1965) is a Canadian award-winning physicist specializing in the study of black holes. Poisson is a professor at the University of Guelph as well as an affiliate member of the Perimeter Institute for Theoretical Physics, in Waterloo, Ontario, Canada. Education He was born in Montreal, Quebec, and grew up in Rimouski and Quebec City. He obtained his bachelor of science degree from Laval University in Quebec City, and his Ph.D. at the University of Alberta, in Edmonton. He received his doctorate in 1991 under the supervision of Werner Israel. Research Poisson's doctoral dissertation was on the concept of mass inflation (not to be confused with cosmological inflation), which he pioneered with Israel. Prior to the understanding of mass inflation, it was believed that wormholes into other universes would be found inside some black holes. Mass inflation closes off these wormholes in realistic black holes. After completing his doctorate, Poisson spent three ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gary Horowitz
Gary T. Horowitz (born April 14, 1955 in Washington, D.C.) is an American theoretical physicist who works on string theory and quantum gravity. Biography Horowitz studied at Princeton University (Bachelor 1976) and obtained his Ph.D. in 1979 at the University of Chicago with Robert Geroch. Subsequently, he was a post-doc at the University of California, Santa Barbara and Oxford University (as a NATO Fellow). In 1981-1983 he worked as an Einstein Fellow at the Institute for Advanced Study. He became an Assistant Professor in 1983, Associate Professor in 1986, and finally Professor in 1990 at the University of California at Santa Barbara. Horowitz investigates gravitational phenomena, such as black holes, in string theory. In the 1990s, he worked with, among others, Andrew Strominger and Joseph Polchinski showing that string theory provides a description of the quantum microstates of certain black holes (following earlier work of Strominger and Cumrun Vafa). In 1985 Horowitz pub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abhay Ashtekar
Abhay Vasant Ashtekar (born 5 July 1949) is an Indian theoretical physicist. He is the Eberly Professor of Physics and the Director of the Institute for Gravitational Physics and Geometry at Pennsylvania State University. As the creator of Ashtekar variables, he is one of the founders of loop quantum gravity and its subfield loop quantum cosmology. He has also written a number of descriptions of loop quantum gravity that are accessible to non-physicists. In 1999, Ashtekar and his colleagues were able to calculate the entropy for a black hole, matching a legendary 1974 prediction by Hawking. Oxford mathematical physicist Roger Penrose has described Ashtekar's approach to quantum gravity as "The most important of all the attempts at 'quantizing' general relativity." Ashtekar was elected as Member to National Academy of Sciences in May 2016. Biography Abhay Ashtekar grew up in several cities, including Mumbai, in the state of Maharashtra, India. After completing his undergra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clifford Will
Clifford Martin Will (born 1946) is a Canadian-born theoretical physicist noted for his contributions to general relativity. Life and work Will was born in Hamilton, Ontario. In 1968, he earned a B.Sc. from McMaster University. At Caltech, he studied under Kip Thorne, earning his Ph.D. in 1971. He has taught at the University of Chicago and Stanford University, and in 1981 joined the faculty of Washington University in St. Louis. In 2012, he moved to a faculty position at the University of Florida. Will's theoretical work has centered on Post-Newtonian expansions of approximate solutions to the Einstein field equation, a notoriously difficult area which forms the theoretical underpinnings essential for such achievements as the indirect verification by Russell Hulse and Joseph Taylor of the existence of gravitational radiation from observations of a binary pulsar. Will's book reviewing experimental tests of general relativity is widely regarded as the essential resource for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Wald
The name Robert is an ancient Germanic given name, from Proto-Germanic "fame" and "bright" (''Hrōþiberhtaz''). Compare Old Dutch ''Robrecht'' and Old High German ''Hrodebert'' (a compound of '' Hruod'' ( non, Hróðr) "fame, glory, honour, praise, renown" and ''berht'' "bright, light, shining"). It is the second most frequently used given name of ancient Germanic origin. It is also in use as a surname. Another commonly used form of the name is Rupert. After becoming widely used in Continental Europe it entered England in its Old French form ''Robert'', where an Old English cognate form (''Hrēodbēorht'', ''Hrodberht'', ''Hrēodbēorð'', ''Hrœdbœrð'', ''Hrœdberð'', ''Hrōðberχtŕ'') had existed before the Norman Conquest. The feminine version is Roberta. The Italian, Portuguese, and Spanish form is Roberto. Robert is also a common name in many Germanic languages, including English, German, Dutch, Norwegian, Swedish, Scots, Danish, and Icelandic. It can be use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Werner Israel
Werner Israel, (October 4, 1931 – May 18, 2022) was a physicist, author, researcher, and professor at the University of Victoria. Biography Born in Berlin, Germany and raised in Cape Town, South Africa, he first received his B.Sc. in 1951 and later his M.Sc. in 1954 from the University of Cape Town. From 1956 to 1958, he worked as a scholar at the Dublin Institute for Avanced Studies. He then went on to receive his Ph.D. in 1960 from Trinity College, Dublin. In 1990, together with Eric Poisson, Israel pioneered the study of black hole interiors and, following up a suggestion of Roger Penrose, discovered the phenomenon of mass inflation (which should not be confused with inflationary cosmology). He was a Fellow in the cosmology programme of the Canadian Institute for Advanced Research. Until his retirement in 1996 he was a professor in the Department of Physics at the University of Alberta. In 1996 he was appointed Adjunct Professor of Physics and Astronomy at the Univer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roger Penrose
Sir Roger Penrose (born 8 August 1931) is an English mathematician, mathematical physicist, philosopher of science and Nobel Laureate in Physics. He is Emeritus Rouse Ball Professor of Mathematics in the University of Oxford, an emeritus fellow of Wadham College, Oxford, and an honorary fellow of St John's College, Cambridge and University College London. Penrose has contributed to the mathematical physics of general relativity and cosmology. He has received several prizes and awards, including the 1988 Wolf Prize in Physics, which he shared with Stephen Hawking for the Penrose–Hawking singularity theorems, and one half of the 2020 Nobel Prize in Physics "for the discovery that black hole formation is a robust prediction of the general theory of relativity". He is regarded as one of the greatest living physicists, mathematicians and scientists, and is particularly noted for the breadth and depth of his work in both natural and formal sciences. Early life and education Bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Relativity And Gravitation
A general officer is an officer of high rank in the armies, and in some nations' air forces, space forces, and marines or naval infantry. In some usages the term "general officer" refers to a rank above colonel."general, adj. and n.". OED Online. March 2021. Oxford University Press. https://www.oed.com/view/Entry/77489?rskey=dCKrg4&result=1 (accessed May 11, 2021) The term ''general'' is used in two ways: as the generic title for all grades of general officer and as a specific rank. It originates in the 16th century, as a shortening of ''captain general'', which rank was taken from Middle French ''capitaine général''. The adjective ''general'' had been affixed to officer designations since the late medieval period to indicate relative superiority or an extended jurisdiction. Today, the title of ''general'' is known in some countries as a four-star rank. However, different countries use different systems of stars or other insignia for senior ranks. It has a NATO rank scal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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