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Dynamical-screening and the phantom-like effects in a DGP-inspired F(R, ) model

Dynamical-screening and the phantom-like effects in a DGP-inspired F(R, ) model Based on the Lue-Starkman conjecture on the dynamical screening ofthe brane cosmological constant in the DGP scenario, we extend thisproposal to a general DGP-inspired F(R, ) model. We show thatmodification of the induced gravity and its coupling to aquintessence field localized on the brane, affects the screening ofthe brane cosmological constant and also phantom-like behavior onthe brane. We extend our study to possible modification of theinduced gravity on the brane and for clarification some specificexamples are presented. As a result, phantom-like behavior can berealized in this setup without violating the null energy conditionat least in some subspaces of the model parameter space. The keyresult of our study is the fact that a DGP-inspired F(R, )scenario has the best fit with LCDM and recent observations thanother alternative theories. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Cosmology and Astroparticle Physics IOP Publishing

Dynamical-screening and the phantom-like effects in a DGP-inspired F(R, ) model

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Copyright
Copyright © IOP Publishing Ltd
eISSN
1475-7516
DOI
10.1088/1475-7516/2009/07/010
Publisher site
See Article on Publisher Site

Abstract

Based on the Lue-Starkman conjecture on the dynamical screening ofthe brane cosmological constant in the DGP scenario, we extend thisproposal to a general DGP-inspired F(R, ) model. We show thatmodification of the induced gravity and its coupling to aquintessence field localized on the brane, affects the screening ofthe brane cosmological constant and also phantom-like behavior onthe brane. We extend our study to possible modification of theinduced gravity on the brane and for clarification some specificexamples are presented. As a result, phantom-like behavior can berealized in this setup without violating the null energy conditionat least in some subspaces of the model parameter space. The keyresult of our study is the fact that a DGP-inspired F(R, )scenario has the best fit with LCDM and recent observations thanother alternative theories.

Journal

Journal of Cosmology and Astroparticle PhysicsIOP Publishing

Published: Jul 1, 2009

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