Non-Gaussianity in three fluid curvaton model

Details Non-Gaussianity in three fluid curvaton model Non-Gaussianity in three fluid curvaton model

2008-03-18

arxiv.org/abs/0803.2637v1

Phys.Rev.D79:103516,2009

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures

Scientific paper

10.1103/PhysRevD.79.103516

The generation of non-gaussianity is studied in a three fluid curvaton model. By utilizing second order perturbation theory we derive general formulae for the large scale temperature fluctuation and non-gaussianity parameter, $f_{NL}$, that includes the possibility of a non-adiabatic final state. In the adiabatic limit we recover previously known results. The results are applied to a three fluid curvaton model where the curvaton decays into radiation and matter. We find that the amount of non-gaussianity decreases as the final state of the system becomes more adiabatic and that the generated non-gaussianity in the scenario is small, $|f_{NL}| \sim \mathcal{O}(1)$.

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