Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-03
Phys.Rev.D69:043503,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX file, 8 pages. Some typos corrected. In Sec. IIIA non-local gradient terms explicitly accounted for in the final non-lin
Scientific paper
10.1103/PhysRevD.69.043503
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 cosmological adiabatic perturbations, we study the evolution of the second-order cosmological curvature perturbation on super-horizon scales in the curvaton scenario. We provide the exact expression for the non-Gaussianity in the primordial perturbations including gravitational second-order corrections which are particularly relevant in the case in which the curvaton dominates the energy density before it decays. As a byproduct, we show that in the standard scenario where cosmological curvature perturbations are induced by the inflaton field, the second-order curvature perturbation is conserved even during the reheating stage after inflation.
Bartolo Nicola
Matarrese Sabino
Riotto Antonio
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