404 citations · 1.4k across the 23 of their papers we have counts for
6 papers · 1 filter
Inflation and dark energy arising from geometrical tachyons
Sudhakar Panda, M. Sami, Shinji Tsujikawa
We study the motion of a BPS D3-brane in the NS5-brane ring background. The radion field becomes tachyonic in this geometrical set up. We investigate the potential of this geometri…
Phantom damping of matter perturbations
Luca Amendola, Shinji Tsujikawa, M. Sami
Cosmological scaling solutions are particularly important in solving the coincidence problem of dark energy. We derive the equations of sub-Hubble linear matter perturbations for a…
Dark energy and cosmological solutions in second-order string gravity
Gianluca Calcagni, Shinji Tsujikawa, M Sami
We study the cosmological evolution based upon a -dimensional action in low-energy effective string theory in the presence of second-order curvature corrections and a modulus sc…
The fate of (phantom) dark energy universe with string curvature corrections
M. Sami, Alexey Toporensky, Peter V. Tretjakov +1
We study the evolution of (phantom) dark energy universe by taking into account the higher-order string corrections to Einstein-Hilbert action with a fixed dilaton. While the prese…
Coupled dark energy: Towards a general description of the dynamics
Burin Gumjudpai, Tapan Naskar, M. Sami +1
In dark energy models of scalar-field coupled to a barotropic perfect fluid, the existence of cosmological scaling solutions restricts the Lagrangian of the field $\vp$ to $p=X g(X…
Manybody treatment of white dwarf and neutron stars on the brane
Mofazzal Azam, M. Sami
Brane-World models suggest modification of Newton's law of gravity on the 3-brane at submillimeter scales. The brane-world induced corrections are in higher powers of inverse dista…