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Perturbations in cosmologies with a scalar field and a perfect fluid
Nicola Bartolo, Pier-Stefano Corasaniti, Andrew R. Liddle +1
We study the properties of cosmological density perturbations in a multi-component system consisting of a scalar field and a perfect fluid. We discuss the number of degrees of free…
Evolution of Second-Order Cosmological Perturbations and Non-Gaussianity
N. Bartolo, S. Matarrese, A. Riotto
We present a second-order gauge-invariant formalism to study the evolution of curvature perturbations in a Friedmann-Robertson-Walker universe filled by multiple interacting fluids…
On Non-Gaussianity in the Curvaton Scenario
N. Bartolo, S. Matarrese, A. Riotto
Since a positive future detection of non-linearity in the cosmic microwave background anisotropy pattern might allow to descriminate among different mechanisms giving rise to cosmo…
Enhancement of Non-Gaussianity after Inflation
N. Bartolo, S. Matarrese, A. Riotto
We study the evolution of cosmological perturbations on large scales, up to second order, for a perfect fluid with generic equation of state. Taking advantage of super-horizon cons…