Journal article
Extra-dimensional cosmology with domain-wall branes
DP George, M Trodden, RR Volkas
Journal of High Energy Physics | SPRINGER | Published : 2009
Abstract
We show how to define a consistent braneworld cosmology in a model in which the brane is constructed as a field-theoretic domain wall of finite thickness. The Friedmann, Robertson-Walker metric is recovered in the region of the brane, but, remarkably, with scale factor that depends on particle energy and on particle species, constituting a breakdown of the weak equivalence principle on sufficiently small scales. This unusual effect comes from the extended nature of particles confined to a domain-wall brane, and the fact that they feel an ''average'' of the bulk spacetime. We demonstrate how to recover the standard results of brane cosmology in the infinitely-thin brane limit, and comment on ..
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Awarded by National Science Foundation
Funding Acknowledgements
DPG and RRV thank Archil Kobakhidze for discussion and comments on the manuscript. DPG also thanks the Department of Physics at Syracuse University for their warm hospitality, where, during his visit, he had the opportunity to carry out the majority of this work. MT would like to thank the University of Melbourne for the award of a Sir Thomas Lyle Fellowship, during which this work began, and the School of Physics at Melbourne for their hospitality during his tenure there. DPG was supported by the Puzey Bequest to the University of Melbourne and the Melbourne School of Graduate Research at the University of Melbourne. The work of MT is supported in part by the National Science Foundation under grant PHY-0653563, and by NASA ATP grant NNX08AH27G. RRV is supported in part by the Australian Research Council.