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Correlation-consistency cartography of the double inflation landscape
Shinji Tsujikawa, David Parkinson, Bruce A. Bassett
We show explicitly some exciting features of double-inflation: (i) it can often lead to strongly correlated adiabatic and entropy (isocurvature) power spectra. (ii) The two-field s…
On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations
Shinji Tsujikawa, Robert Brandenberger, Fabio Finelli
We consider the construction of nonsingular Pre-Big-Bang and Ekpyrotic type cosmological models realized by the addition to the action of specific higher-order terms stemming from…
When can preheating affect the CMB?
Shinji Tsujikawa, Bruce A. Bassett
We discuss the principles governing the selection of inflationary models for which preheating can affect the CMB. This is a (fairly small) subset of those models which have non-neg…
Nature of singularities in anisotropic string cosmology
Alexey Toporensky, Shinji Tsujikawa
We study nature of singularities in anisotropic string-inspired cosmological models in the presence of a Gauss-Bonnet term. We analyze two string gravity models-- dilaton-driven an…