167 citations · 684 across the 15 of their papers we have counts for
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Density perturbations in f(R) gravity theories in metric and Palatini formalisms
Shinji Tsujikawa, Kotub Uddin, Reza Tavakol
We make a detailed study of matter density perturbations in both metric and Palatini formalisms in theories whose Lagrangian density is a general function, f(R), of the Ricci scala…
Geodesic motion in the neighbourhood of submanifolds embedded in warped product spaces
Fabio Dahia, Carlos Romero, Lucio F. P. Silva +1
We study the classical geodesic motions of nonzero rest mass test particles and photons in (3+1+n)- dimensional warped product spaces. An important feature of these spaces is that…
A note on the large-angle anisotropies in the WMAP cut-sky maps
A. Bernui, B. Mota, M. J. Reboucas +1
Recent analyses of the WMAP data seem to indicate the possible presence of large-angle anisotropy in the Universe. If confirmed, these can have important consequences for our under…
Non-linear vector perturbations in a contracting universe
Filipe C. Mena, David J. Mulryne, Reza Tavakol
A number of scalar field models proposed as alternatives to the standard inflationary scenario involve contracting phases which precede the universe's present phase of expansion. A…
Warped product spaces and geodesic motion in the neighbourhood of hypersurfaces
F. Dahia, C. Romero, L. F. P. Silva +1
We study the classical geodesic motions of nonzero rest mass test particles and photons in five-dimensional warped product spaces. We show that it is possible to obtain a general p…
f(R) gravity theories in Palatini formalism: cosmological dynamics and observational constraints
Stephane Fay, Reza Tavakol, Shinji Tsujikawa
We make a systematic study of the cosmological dynamics for a number of f(R) gravity theories in Palatini formalism. We find a number of interesting results: (i) models based on th…