Given the proliferation of bouncing models in recent years, we gather and critically assess
these proposals in a comprehensive review. The PLANCK data shows an unmistakably red …

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 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 …

We present a nonsingular bouncing cosmology using single scalar field matter with non-
trivial potential and non-standard kinetic term. The potential sources a dynamical attractor …

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We investigate quantum decoherence in a class of models which interpolates between
expanding (inflation) and contracting (ekpyrosis) scenarios. For the cases which result in a …

In this review, a number of approaches to superstring cosmology which make use of key
features which distinguish string theory from point particle theories are discussed, with …

Ekpyrotic and cyclic cosmologies provide theories of the very early and of the very late
universe. In these models, the big bang is described as a collision of branes—and thus the …

In this paper, we present a new scenario of the early universe that contains a pre-big bang
ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the …

We analyze a general mechanism for producing a nearly scale-invariant spectrum of
cosmological curvature perturbations during a contracting phase preceding a big bang …