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Aspects of superstring cosmology are reviewed with an emphasis on the cosmological
implications of duality symmetries in the theory. The string effective actions are summarized …

In recent years, the use of conformal transformation techniques has become widespread in
the literature on gravitational theories alternative to general relativity, on cosmology, and on …

We formulate cosmological perturbation theory around the spatially curved FLRW
background in the context of metric-affine gauge theory of gravity which includes torsion and …

We present an analysis of the cosmological evolution of matter sources with small
anisotropic pressures. This includes electric and magnetic fields, collisionless relativistic …

We show that curvature perturbations acquire a scale invariant spectrum for any constant
equation of state, provided the fluid has a suitably time-dependent sound speed. In order for …

We construct, for the first time, a model of graceful exit transition from a dilaton-driven
inflationary phase to a decelerated Friedmann-Robertson-Walker era. Exploiting a …

I present two examples in which the curvature singularity of a radiation-dominated Universe
is regularized by (a) the repulsive effects of spin interactions, and (b) the repulsive effects …

Three-forms can give rise to viable cosmological scenarios of inflation and dark energy with
potentially observable signatures distinct from standard single scalar field models. In this …

We consider conditions necessary for a successful implementation of the so-called assisted
inflation. We generalize the applicability of assisted inflation beyond exponential potentials …