Covariant perturbations in f (R) - gravity of multi-component fluid cosmologies

We study the evolution of scalar cosmological perturbations in the 1+3 Covariant Gauge-Invariant formalism for generic f(R) theories of gravity. Working in the energy frame of the total matter, we give a complete set 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. We apply the perturbation equations around a background solution of Rⁿ gravity and look at exact solutions for scales much smaller and much larger than the Hubble radius.

Grantor dc:publisher.institution

Department of Mathematics and Applied Mathematics

Year dc:date.issued

2009

Author dc:creator

• Gidelew, Amare Abebe

Advisor dc:contributor.advisor

• Dunsby, Peter K S

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/11427/4884

OAI identifier oai:identifier

oai:open.uct.ac.za:11427/4884