Speaker
Mr
MOHAMED ABDELWAHAB
(uct)
Description
In this paper we studied multi-fluid perturbations to fourth order theories of gravity
in a FLRW background. applying the 1+3 covariant gauge-invariant
formalism of cosmological perturbations and derive a complete set of evolution equations for matter
and curvature inhomogeneities.We then specialize to a radiation-dust
fuid described by barotropic equations of state and 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.In particular, we analyze quasi-static approximations and show the analytic solutions of these approximation.
Primary authors
Mr
Amare ABEBE
(uct)
Mr
MOHAMED ABDELWAHAB
(uct)
Co-author
Mr
Peter Dunsby
(uct)
