We review the formalism and applications of non-linear perturbation theory (PT) to
understanding the large-scale structure of the Universe. We first discuss the dynamics of …

Gravitational-wave experiments with interferometers and with resonant masses can search
for stochastic backgrounds of gravitational waves of cosmological origin. We review both …

We review the status of bouncing cosmologies as alternatives to cosmological inflation for
providing a description of the very early universe, and a source for the cosmological …

The theory of inflation with single and multiple fields is reviewed paying particular attention
to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the …

We present a mechanism for the origin of the large-scale curvature perturbation in our
Universe by the late decay of a massive scalar field, the curvaton. The curvaton is light …

We review the study of inhomogeneous perturbations about a homogeneous and isotropic
background cosmology. We adopt a coordinate based approach, but give geometrical …

We consider the pre-Big-Bang scenario with a massive axion field which starts to dominate
energy density when oscillating in an instanton-induced potential and subsequently reheats …

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We analyze the primordial density perturbation when it is generated by a “curvaton” field
different from the inflaton. In some cases this perturbation may have large isocurvature …

In pre-big-bang and in ekpyrotic cosmology, perturbations on cosmological scales today are
generated from quantum vacuum fluctuations during a phase when the Universe is …