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astro-ph2005
Non-Gaussian perturbations from multi-field inflation
Laura E. Allen, Sujata Gupta, David Wands
We show how the primordial bispectrum of density perturbations from inflation may be characterised in terms of manifestly gauge-invariant cosmological perturbations at second order…
astro-ph2005
Dynamics and Non-Gaussianity in the Weak-Dissipative Warm Inflation Scenario
Sujata Gupta
We calculate the general solutions for a warm inflationary scenario with weak dissipation, reviewing the dissipative dynamics of the two-fluid system, and calculate the bispectrum…
astro-ph2003
Curvature and isocurvature perturbations in a three-fluid model of curvaton decay
Sujata Gupta, Karim A. Malik, David Wands
We study the evolution of the cosmological perturbations after inflation in curvaton models where the non-relativistic curvaton decays into both radiation and a cold dark matter co…