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Title: Consistent cosmological modifications to the Einstein equations

Abstract

General relativity is a phenomenologically successful theory that rests on firm foundations, but has not been tested on cosmological scales. The deep mystery of dark energy (and possibly even the requirement of cold dark matter), has increased the need for testing modifications to general relativity, as the inference of such otherwise undetected fluids, depends crucially on the theory of gravity. In this work I outline a general scheme for constructing consistent and covariant modifications to the Einstein equations. This framework is such that there is a clear connection between the modification and the underlying field content that produces it. I argue that this is mandatory for distinguishing modifications of gravity from conventional fluids. I give two nontrivial examples, the first of which is a simple metric-based modification of the fluctuation equations for which the background is exact {lambda}CDM and the second has a Dvali-Gabadadze-Porrati background but differs from it in the perturbations. I present their impact on observations of the cosmic microwave background radiation.

Authors:
 [1]
  1. Perimeter Institute, Waterloo, Ontario N2L 2Y5 (Canada)
Publication Date:
OSTI Identifier:
21300958
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 79; Journal Issue: 12; Other Information: DOI: 10.1103/PhysRevD.79.123527; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; DISTURBANCES; EINSTEIN FIELD EQUATIONS; FLUCTUATIONS; GENERAL RELATIVITY THEORY; GRAVITATION; METRICS; MODIFICATIONS; NONLUMINOUS MATTER; PERTURBATION THEORY; RELICT RADIATION

Citation Formats

Skordis, Constantinos. Consistent cosmological modifications to the Einstein equations. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.79.123527.
Skordis, Constantinos. Consistent cosmological modifications to the Einstein equations. United States. https://doi.org/10.1103/PHYSREVD.79.123527
Skordis, Constantinos. 2009. "Consistent cosmological modifications to the Einstein equations". United States. https://doi.org/10.1103/PHYSREVD.79.123527.
@article{osti_21300958,
title = {Consistent cosmological modifications to the Einstein equations},
author = {Skordis, Constantinos},
abstractNote = {General relativity is a phenomenologically successful theory that rests on firm foundations, but has not been tested on cosmological scales. The deep mystery of dark energy (and possibly even the requirement of cold dark matter), has increased the need for testing modifications to general relativity, as the inference of such otherwise undetected fluids, depends crucially on the theory of gravity. In this work I outline a general scheme for constructing consistent and covariant modifications to the Einstein equations. This framework is such that there is a clear connection between the modification and the underlying field content that produces it. I argue that this is mandatory for distinguishing modifications of gravity from conventional fluids. I give two nontrivial examples, the first of which is a simple metric-based modification of the fluctuation equations for which the background is exact {lambda}CDM and the second has a Dvali-Gabadadze-Porrati background but differs from it in the perturbations. I present their impact on observations of the cosmic microwave background radiation.},
doi = {10.1103/PHYSREVD.79.123527},
url = {https://www.osti.gov/biblio/21300958}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 12,
volume = 79,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2009},
month = {Mon Jun 15 00:00:00 EDT 2009}
}