Universidad Complutense de Madrid
E-Prints Complutense

Covariant gauge-invariant perturbations in multifluid f (R) gravity

Impacto

Downloads

Downloads per month over past year

Abebe, Amare and Abdelwahab, Mohamed and Cruz Dombriz, Álvaro de la and Dunsby, Peter K. S. (2012) Covariant gauge-invariant perturbations in multifluid f (R) gravity. Classical and quantum gravity, 29 (13). ISSN 0264-9381

[img]
Preview
PDF
501kB

Official URL: http://dx.doi.org/10.1088/0264-9381/29/13/135011




Abstract

We study the evolution of scalar cosmological perturbations in the 1 + 3 covariant gauge-invariant formalism for generic f(R) theories of gravity. Extending previous works, we give a complete set of equations describing the evolution of matter and curvature fluctuations for a multi-fluid cosmological medium. We then specialize to a radiation-dust fluid described by barotropic equations of state and solve the perturbation equations around a background solution of R^n gravity. In particular, we study exact solutions for scales much smaller and much larger than the Hubble radius and show that n > 2/3 in order to have a growth rate compatible with the Mészáros effect.


Item Type:Article
Additional Information:

© 2012 IOP Publishing Ltd. The authors thank the National Research Foundation (NRF, SouthAfrica) for financial support. AdlCD also acknowledges financial support from MICINN (Spain) project numbers FPA 2008-00592, FIS 2011-23000 and Consolider-Ingenio MULTIDARK CSD2009-00064.

Uncontrolled Keywords:Probe wmap observations; Cosmological perturbations; Dark energy; Constant; Dynamics; Models
Subjects:Sciences > Physics
ID Code:28892
Deposited On:27 Feb 2015 19:07
Last Modified:27 Feb 2015 19:07

Origin of downloads

Repository Staff Only: item control page