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Extra-dimensional cosmology with domain-wall branes

Damien P. George1, Mark Trodden2,3,4 and Raymond R. Volkas1

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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 how our results have the potential to place bounds on parameters such as the thickness of domain-wall braneworlds.

Keywords

p-branes

Extra Large Dimensions

Cosmology of Theories beyond the SM

 

E-print Number: 0810.3746

Cited: by |

Refers: to

PACS

98.80.Cq Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.)

11.25.Uv D branes

11.27.+d Extended classical solutions; cosmic strings, domain walls, texture

Subjects

Gravitation and cosmology

Particle physics and field theory

Astrophysics and astroparticles

Dates

Issue 02 (February 2009)

Received 31 October 2008, accepted for publication 23 January 2009

Published 11 February 2009



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