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Phys. Rev. D 74, 104017 (2006) [4 pages]

Matter instability in modified gravity

Abstract

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Valerio Faraoni
Physics Department, Bishop's University, Sherbrooke, Quèbec, Canada J1M 0C8

Received 23 August 2006; published 14 November 2006

TheDolgov-Kawasaki instability discovered in the matter sector of the modifiedgravity scenario incorporating a -µ⁴/R correction to Einstein gravity isstudied in general f(R) theories. A stability condition is foundin the metric version of these theories to help rulingout models that are unviable from the theoretical point ofview. For example, the theories f(R)=R+alphaµ²⁽ⁿ⁺¹⁾/Rⁿ, where alpha and nare real constants and n>0, are ruled out for anynegative value of alpha.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevD.74.104017
DOI:	10.1103/PhysRevD.74.104017
PACS:	04.50.+h; 04.90.+e; 98.80.-k 04.50.+h Gravity in more than four dimensions, Kaluza–Klein theory, unified field theories; alternative theories of gravity 04.90.+e Other topics in general relativity and gravitation (restricted to new topics in section 04) 98.80.-k Cosmology YEAR: 2006
KEYWORDS:	gravitation, general relativity, cosmology, supernovae, radiofrequency cosmic radiation, dark energy

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