期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2007/01/008
关键词
cosmological perturbation theory; inflation; physics of the early universe
We present an estimate for the non-linear parameter tau(NL), which measures the non-Gaussianity imprinted in the trispectrum of the comoving curvature perturbation, zeta. Our estimate is valid throughout the inflationary era, until the slow-roll approximation breaks down, and takes into account the evolution of perturbations on superhorizon scales. We find that the non-Gaussianity is always small if the field values at the end of inflation are negligible when compared to their values at horizon crossing. Under the same assumption, we show that in N-flation-type scenarios, where the potential is a sum of monomials, the non-Gaussianity measured by tau(NL) is independent of the couplings and initial conditions.
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