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Gravitation
About: Gravitation is a research topic. Over the lifetime, 29306 publications have been published within this topic receiving 821510 citations.
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TL;DR: In this article, a scalar-tensor theory of gravitation is formulated by imposing global scale invariance to the matter part, which is not a variable-G theory in the usual sense.
Abstract: A viable scalar-tensor theory of gravitation is formulated by imposing global scale invariance to the matter part. Nonvanishing masses m of elementary particles as well as the gravitational constant G emerge through the cosmological background value of the scalar field. The scalar field maintains a dynamical degree of freedom in exchange for conformal invariance enjoyed otherwise by the gravity part. The temporal developments of G, m, and the scale factor of the Universe are determined simultaneously by solving coupled differential equations. In the simplest single-scalar model the result is not a variable-G theory in the usual sense. Departures from the standard theory occur through the time-dependent cosmological term. Of particular interest among the solutions are the asymptotically standard solutions.
264 citations
TL;DR: In this article, the authors present physical requirements on gravitational avatars of nonlinear electrodynamics and illustrate them with explicit determinantal Born - Infeld - Einstein models.
Abstract: We present some obvious physical requirements on gravitational avatars of nonlinear electrodynamics and illustrate them with explicit determinantal Born - Infeld - Einstein models. A related procedure, using compensating Weyl scalars, permits us to formulate conformally invariant versions of these systems as well.
264 citations
TL;DR: In this paper, the numerous ways of introducing spatial gravitational forces are fit together in a single framework enabling their interrelationships to be clarified, and the framework is then used to treat the acceleration equals force equation and gyroscope precession, both of which are then discussed in the post-Newtonian approximation, followed by a brief examination of the Einstein equations themselves.
264 citations
TL;DR: Einstein's theory of gravitation is compared with the theory of the electromagnetic field, and some common features of the two theories are pointed out as discussed by the authors. But it is also shown that the well-known peculiarities of Einstein's theory are a necessary consequence of the fact that Einstein's field corresponds to particles of spin 2.
Abstract: Einstein's theory of gravitation is compared with Maxwell's theory of the electromagnetic field, and some common features of the two theories are pointed out. It is also shown that the well-known peculiarities of Einstein's theory are a necessary consequence of the fact that Einstein's field corresponds to particles of spin 2.
263 citations
01 Jan 1994
TL;DR: Ohanian and Ruffini's Gravitation and Spacetime, Second Edition, the authors is the best book on the market today of 500 pages or less on gravitation and general relativity.
Abstract: Now more than ever, Gravitation and Spacetime, Second Edition, by Hans C. Ohanian and new coauthor Remo Ruffini, deserves John Wheeler's praise as "the best book on the market today of 500 pages or less on gravitation and general relativity." Gravitation and Spacetime has been thoroughly updated with the most exciting finds and hottest theoretical topics in general relativity and cosmology. Highlights of the revision include the rise and fall of the fifth force, principles and applications of gravitational lensing, COBE's spectacular confirmation of the blackbody spectrum of the cosmic thermal radiation, theories of dark matter and inflation, and the early universe as a testing ground for particle physicists' unification theories, and much, much more. The ideal choice for a graduate-level introduction to general relativity, Gravitation and Spacetime is also suitable for an advanced undergaduate course.
263 citations