Non-Gaussianity Generated by the Entropic Mechanism in Bouncing Cosmologies Made Simple - High Energy Physics - TheoryReport as inadecuate




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Abstract: Non-gaussianity in the microwave background radiation is bound to play a keyrole in giving us clues about the physics of the very early universe. However,the associated calculations, at second and even third order in perturbationtheory, tend to be complicated to the point of obscuring simple underlyingphysical processes. In this note, we present a simple analytic procedure forapproximating the non-linearity parameters f {NL} and g {NL} for cyclic modelsin which the cosmological perturbations are generated via the entropicmechanism. Our approach is quick, physically transparent and agrees well withthe results of numerical calculations.



Author: Jean-Luc Lehners, Paul J. Steinhardt

Source: https://arxiv.org/







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