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By Salvatore Capozziello (auth.), Claudia Moreno González, José Edgar Madriz Aguilar, Luz Marina Reyes Barrera (eds.)

Proceedings from the 2012 Fourth overseas assembly on Gravitation and Cosmology, concentrating on speeded up cosmic expansion

This quantity presents either an replace and a overview of the country of different theories of gravity in reference to the sped up enlargement of the universe factor. diverse theoretical proposals exist to give an explanation for the acceleration within the cosmic growth, producing the darkish power factor and commencing the prospect to theories of gravity replacement to normal relativity. comparable concerns equivalent to the darkish subject challenge also are surveyed to be able to supply the readers profound perception at the topic from various issues of view. made out of brief talks and plenary lectures given via major specialists within the box, a few of them with extraordinary and ancient contributions, the booklet permits the reader to discover readable and referenced surveys in themes like f(R) theories, the darkish topic and darkish strength matters, converted Newtonian Dynamics (MOND) eventualities, f(T) theories, scalar-tensor theories derived from non-Riemannian geometries, emergent universes, the cosmological consistent and different issues of present curiosity for more youthful and senior physicists and graduate scholars.

These lawsuits are from the Fourth overseas assembly on Gravitation and Cosmology, held in Guadalajara, Jalisco, México, from 20 - 25 could, 2012, was once backed through ICTP- Trieste, Italy and COECyTJAL-Universidad de Guadalajara, México. This occasion is a chain of medical conferences begun in 2004 in Cuba, targeting present and chosen themes within the fields of gravitation and cosmology.

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Additional resources for Accelerated Cosmic Expansion: Proceedings of the Fourth International Meeting on Gravitation and Cosmology

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Before we consider the variation with respect to the metric, we need to specify the form of the matter action Sm . Let us show first why the matter action of the metric Brans-Dicke (BD) theory does not constitute a good choice. In view of the fact already established that space-time is in addition characterized by a scalar field, it is reasonable to expect that matter will couple to the metric as well as to the scalar field. Another reason for rejecting the BD coupling for matter is the following: the matter action of the Brans-Dicke theory in the Palatini formalism does not satisfy the Einstein Equivalence Principle (EEP).

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A generic feature of all of the modified gravity schemes mentioned above is the appearance of an acceleration scale, a0 , above which classical gravity is recovered, and below which the dark matter mimicking regime appears. This last feature results in a general prediction; all systems where a >> a0 should appear as devoid of dark matter, and all systems where a << a0 should appear as dark matter dominated, when interpreted under classical gravity. It is interesting that no a >> a0 system has ever been detected where dark matter needs to be invoked, in accordance with the former condition.

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