RT Journal Article
T1 Covariant gauge-invariant perturbations in multifluid f (R) gravity
A1 Abebe, Amare
A1 Abdelwahab, Mohamed
A1 Cruz Dombriz, Álvaro de la
A1 Dunsby, Peter K. S.
AB 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.
PB Institute of Physics
SN 0264-9381
YR 2012
FD 2012-07-07
LK https://hdl.handle.net/20.500.14352/44480
UL https://hdl.handle.net/20.500.14352/44480
LA eng
NO © 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.
NO National Research Foundation (NRF, SouthAfrica)
NO Ministerio de Ciencia e Innovación (MICINN), España
NO Ministerio de Economía y Competitividad (MINECO), España
DS Docta Complutense
RD 7 jul 2025