Separable and non-separable multi-field inflation and large non-Gaussianity

TY - JOUR

T1 - Separable and non-separable multi-field inflation and large non-Gaussianity

AU - Mazumdar, Anupam

AU - wang, Lingfei

PY - 2012/9/1

Y1 - 2012/9/1

N2 - In this paper we provide a general framework based on ON formalism to estimate the cosmological observables pertaining to the cosmic microwave background radiation for non-separable potentials, and for generic end of inflation boundary conditions. We provide analytical and numerical solutions to the relevant observables by decomposing the cosmological perturbations along the curvature and the isocurvature directions, instead of adiabatic and entropy directions. We then study under what conditions large bi-spectrum and tri-spectrum can be generated through phase transition which ends inflation. In an illustrative example, we show that large fNL ∼ 0(80) and TNL ∼ 0(20000) can be obtained for the case of separable and non-separable inflationary potentials.

AB - In this paper we provide a general framework based on ON formalism to estimate the cosmological observables pertaining to the cosmic microwave background radiation for non-separable potentials, and for generic end of inflation boundary conditions. We provide analytical and numerical solutions to the relevant observables by decomposing the cosmological perturbations along the curvature and the isocurvature directions, instead of adiabatic and entropy directions. We then study under what conditions large bi-spectrum and tri-spectrum can be generated through phase transition which ends inflation. In an illustrative example, we show that large fNL ∼ 0(80) and TNL ∼ 0(20000) can be obtained for the case of separable and non-separable inflationary potentials.

U2 - 10.1088/1475-7516/2012/09/005

DO - 10.1088/1475-7516/2012/09/005

M3 - Journal article

SN - 1475-7516

VL - 2012

SP - 005

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

IS - 9

ER -