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Braneworld cosmological perturbations

Published online by Cambridge University Press:  30 September 2008

A. Oscoz ,
E. Mediavilla ,
M. Serra-Ricart  and
S.S. Seahra
S.S. Seahra*
Affiliation:
Department of Mathematics & Statistics, University of New Brunswick, Fredericton, New Brunswick, Canada
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Abstract

A longstanding problem in braneworld cosmology is quantifying thedynamics of cosmological perturbations. This is because, unlike the4-dimensional case, fluctuations are governed by non-separablepartial differential equations (PDEs). We have developed a fast andaccurate code to solve the relevant equations of motion, and henceextract observational predictions from braneworld models. Here, webriefly review braneworld scenarios, the perturbation problem, ournumerical methods, and the results we have obtained for theRandall-Sundrum (RS) and Dvali-Gabadadze-Porrati (DGP) scenarios.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 30: Spanish Relativity Meeting - Encuentros Relativistas Españoles, ERE2007: Relativistic Astrophysics and Cosmology , 2008 , pp. 181 - 186
Copyright
© EAS, EDP Sciences, 2008

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References

Cardoso, A., Hiramatsu, T., Koyama, K., & Seahra, S.S., 2007a, Scalar perturbations in braneworld cosmology, JCAP, 07:008
Cardoso, A., Koyama, K., Seahra, S.S., & Silva, F.P., 2007b, Cosmological perturbations in the DGP braneworld: numeric solution
Dvali, G.R., Gabadadze, G., & Porrati, M., 2000, 4D gravity on a brane in 5D Minkowski space, Phys. Lett. B, 485, 208–214 CrossRef
Randall, L., & Sundrum, R., 1999, An alternative to compactification, Phys. Rev. Lett., 83, 4690–4693 CrossRef
Seahra, S.S., 2006, Gravitational waves and cosmological braneworlds: A characteristic evolution scheme, Phys. Rev. D, 74:044010