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Advances in High Energy Physics
Volume 2012, Article ID 679156, 12 pages
http://dx.doi.org/10.1155/2012/679156
Research Article

Matter Instability in Theories with Modified Induced Gravity

1Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P.O. Box 55134-441, Maragha, Iran
2Department of Physics, Faculty of Basic Sciences, University of Mazandaran, P.O. Box 47416-95447, Babolsar, Iran

Received 22 September 2012; Accepted 6 November 2012

Academic Editor: George Siopsis

Copyright © 2012 Kourosh Nozari and Faeze Kiani. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Matter stability is a necessary condition to have a cosmologically viable model. Modified gravity in the spirit of theories suffers from matter instability in some subdomains of the model parameter space. It has been shown recently that the late-time cosmic speedup can be explained through an -modified induced gravity program. In this paper, we study the issue of matter instability in a braneworld setup with modified induced gravity.