Friday, June 8, 2012

1110.1191 (Amare Abebe et al.)

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

Amare Abebe, Mohamed Abdelwahab, Alvaro de la Cruz-Dombriz, Peter K. S. Dunsby
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 M\'esz\'aros effect.
View original: http://arxiv.org/abs/1110.1191

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