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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…
Reconstruction of general scalar-field dark energy models
Shinji Tsujikawa
The reconstruction of scalar-field dark energy models is studied for a general Lagrangian density , where is a kinematic term of a scalar field . We implement the c…
Dynamics of assisted quintessence
Soo A Kim, Andrew R Liddle, Shinji Tsujikawa
We explore the dynamics of assisted quintessence, where more than one scalar field is present with the same potential. For potentials with tracking solutions, the fields naturally…
Inflation Dynamics and Reheating
Bruce A. Bassett, Shinji Tsujikawa, David Wands
We review the theory of inflation with single and multiple fields paying particular attention to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the…
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…