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Twistor (book)
''Twistor'' (1989) is a hard science fiction novel by physicist and science fiction writer John G. Cramer. The novel was first published in hardcover by William Morrow in 1989, then in mass market paperback by Avon Books in 1991. It was reprinted by Avon Books in 1997 with slight revisions. Plot A physics experiment on condensed-matter in a university's physics lab causes an unexpected result when the equipment starts swapping normal and "shadow matter." After industrial espionage causes problems, physicist David Harrison finds himself lost with two small children in an alternate universe where the six-legged wildlife is dangerous and aggressive. David has to find a way back home, while dealing with the spies that caused the problems in the first place. Twistor theory Twistor space is the geometry that results from solutions of Twistor equations. In 1967 Roger Penrose developed a general relativity approach called Twistor theory to apply to the study of quantum gravity Quantum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John G
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died c. AD 30), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (lived c. AD 30), one of the twelve apostles of Jesus * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope John ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Morrow (publisher)
William Morrow (June 15, 1873, in Dublin, Ireland – November 11, 1931, in New York City) was an American publisher. He attended Harvard College, class of 1900. At New York city, on April 24, 1923, he married novelist Honoré Willsie Morrow. He founded William Morrow and Company in 1926 and led it until his death. William Morrow and Company William Morrow and Company was acquired by Scott, Foresman in 1967 and sold in 1981 to the Hearst Corporation, which sold it, along with Avon Books, to the News Corporation in 1999. Both William Morrow and Avon are now imprints of News Corp subsidiary HarperCollins. Among many other authors, Morrow was Nevil Shute Nevil Shute Norway (17 January 189912 January 1960) was an English novelist and aeronautical engineer who spent his later years in Australia. He used his full name in his engineering career and Nevil Shute as his pen name, in order to protect ...'s American publisher for several of his novels. Morrow was the publishe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avon Books
Avon Publications is one of the leading publishers of romance fiction. At Avon's initial stages, it was an American paperback book and comic book publisher. The shift in content occurred in the early 1970s with multiple Avon romance titles reaching and maintaining spots in bestseller lists, demonstrating the market and potential profits in romance publication. As of 2010, Avon is an imprint of HarperCollins. Early history (1941–1971) Avon Books was founded in 1941 by the American News Company (ANC) to create a rival to Pocket Books. They hired brother and sister Joseph Meyers and Edna Meyers Williams to establish the company. ANC bought out J.S. Ogilvie Publications, a dime novel publisher partly owned by both the Meyers, and renamed it "Avon Publications". They also got into comic books. "The early Avons were somewhat similar in appearance to the existing paperbacks of Pocket Books, resulting in an immediate and largely ineffective lawsuit by that company. Despite thi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twistor 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. Development seems to be indirectly influenced by Einstein–Cartan–Sciama–Kibble theory. Overview Mathematically, projective twistor space \mathbb is a 3-dimensional complex manifold, complex projective 3-space \mathbb^3. It has the physical interpretation of the space of massless particles with spin. It is the projectivisation of a 4-dimensional complex vector space, non-projective twistor space \mathb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twistor Space
In mathematics and theoretical physics (especially twistor theory), twistor space is the complex vector space of solutions of the twistor equation \nabla_^\Omega_^=0 . It was described in the 1960s by Roger Penrose and Malcolm MacCallum. According to Andrew Hodges, twistor space is useful for conceptualizing the way photons travel through space, using four complex numbers. He also posits that twistor space may aid in understanding the asymmetry of the weak nuclear force. Informal motivation In the (translated) words of Jacques Hadamard: "the shortest path between two truths in the real domain passes through the complex domain." Therefore when studying four-dimensional space \mathbb^4 it might be valuable to identify it with \mathbb^2. However, since there is no canonical way of doing so, instead all isomorphisms respecting orientation and metric between the two are considered. It turns out that complex projective 3-space \mathbb^3 parametrizes such isomorphisms together with co ... [...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 educati ... [...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 gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Gravity
Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics; it deals with environments in which neither gravitational nor quantum effects can be ignored, such as in the vicinity of black holes or similar compact astrophysical objects, such as neutron stars. Three of the four fundamental forces of physics are described within the framework of quantum mechanics and quantum field theory. The current understanding of the fourth force, gravity, is based on Albert Einstein's general theory of relativity, which is formulated within the entirely different framework of classical physics. However, that description is incomplete: describing the gravitational field of a black hole in the general theory of relativity leads physical quantities, such as the spacetime curvature, to diverge at the center of the black hole. This signals the breakdown of the general theory of relativity and the need for a theory that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1989 American Novels
File:1989 Events Collage.png, From left, clockwise: The Cypress Street Viaduct, Cypress structure collapses as a result of the 1989 Loma Prieta earthquake, killing motorists below; The proposal document for the World Wide Web is submitted; The Exxon Valdez oil tanker runs aground in Prince William Sound, Alaska, causing a large Exxon Valdez oil spill, oil spill; The Fall of the Berlin Wall begins the downfall of Communism in Eastern Europe, and heralds German reunification; The United States United States invasion of Panama, invades Panama to depose Manuel Noriega; The Singing Revolution led to the independence of the Baltic states of Estonia, Latvia, and Lithuania from the Soviet Union; The stands of Hillsborough Stadium in Sheffield, Yorkshire, where the Hillsborough disaster occurred; 1989 Tiananmen Square protests and massacre, Students demonstrate in Tiananmen Square, Beijing; many are killed by forces of the Chinese Communist Party., 300x300px, thumb rect 0 0 200 200 1989 Loma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1989 Science Fiction Novels
File:1989 Events Collage.png, From left, clockwise: The Cypress structure collapses as a result of the 1989 Loma Prieta earthquake, killing motorists below; The proposal document for the World Wide Web is submitted; The Exxon Valdez oil tanker runs aground in Prince William Sound, Alaska, causing a large oil spill; The Fall of the Berlin Wall begins the downfall of Communism in Eastern Europe, and heralds German reunification; The United States invades Panama to depose Manuel Noriega; The Singing Revolution led to the independence of the Baltic states of Estonia, Latvia, and Lithuania from the Soviet Union; The stands of Hillsborough Stadium in Sheffield, Yorkshire, where the Hillsborough disaster occurred; Students demonstrate in Tiananmen Square, Beijing; many are killed by forces of the Chinese Communist Party., 300x300px, thumb rect 0 0 200 200 1989 Loma Prieta earthquake rect 200 0 400 200 World Wide Web rect 400 0 600 200 Exxon Valdez oil spill rect 0 200 300 400 1989 Tiananm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hard Science Fiction
Hard science fiction is a category of science fiction characterized by concern for scientific accuracy and logic. The term was first used in print in 1957 by P. Schuyler Miller in a review of John W. Campbell's ''Islands of Space'' in the November issue of '' Astounding Science Fiction''. The complementary term soft science fiction, formed by analogy to hard science fiction,) first appeared in the late 1970s. The term is formed by analogy to the popular distinction between the "hard" (natural) and "soft" (social) sciences, although there are examples generally considered as "hard" SF, such as Isaac Asimov's ''Foundation'' series, built on mathematical sociology. Science fiction critic Gary Westfahl argues that neither term is part of a rigorous taxonomy; instead they are approximate ways of characterizing stories that reviewers and commentators have found useful. History Stories revolving around scientific and technical consistency were written as early as the 1870s with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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