167 citations · 684 across the 15 of their papers we have counts for
22 papers · 1 filter
Alpha effect and diffusivity in helical turbulence with shear
Dhrubaditya Mitra, Petri J. Käpylä, Reza Tavakol +1
We study the dependence of turbulent transport coefficients, such as the components of the tensor () and the turbulent magnetic diffusivity tensor (), on shear…
Constraints on scalar-tensor models of dark energy from observational and local gravity tests
Shinji Tsujikawa, Kotub Uddin, Shuntaro Mizuno +2
We construct a family of viable scalar-tensor models of dark energy (DE) which possess a phase of late-time acceleration preceded by a standard matter era, while at the same time s…
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…
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…
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…
A model-independent dark energy reconstruction scheme using the geometrical form of the luminosity-distance relation
Stephane Fay, Reza Tavakol
We put forward a new model-independent reconstruction scheme for dark energy which utilises the expected geometrical features of the luminosity-distance relation. The important adv…