What if ... General Relativity is not the theory?

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Title:		What if ... General Relativity is not the theory?
Authors:		Bertolami, Orfeu
Publication:		eprint arXiv:1112.2048
Publication Date:		12/2011
Origin:		ARXIV
Keywords:		General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		17 pages. Based on talks delivered at the "QSO Astrophysics, Fundamental Physics and Astrometric Cosmology in the Gaia era" Meeting, 6-9 June 2011, Faculty of Sciences of University of Porto, Portugal
Bibliographic Code:		2011arXiv1112.2048B

Abstract

The nature of gravity is fundamental to understand the scaffolding of the Universe and its evolution. Einstein's general theory of relativity has been scrutinized for over ninety five years and shown to describe accurately all phenomena from the solar system to the Universe. However, this success is achieved in the case of the largest scales provided one admits contributions to energy-momentum tensor involving dark components such as dark energy and dark matter. Moreover, the theory has well known shortcomings, such as the problem of singularities, the cosmological constant problem and the well known initial conditions problems for the cosmological description. Furthermore, general relativity also does not fit the well known procedures that allow for the quantization of the other fundamental interactions. In this discussion we briefly review the experimental bounds on the foundational principles of general relativity, and present three recent proposals to extend general relativity or, at least, to regard it under different perspectives.

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