Minimal cut-off vacuum state constraints from CMB bispectrum statistics
Abstract
In this short note we translate the best available observational bounds on the CMB bispectrum amplitudes into constraints on a specific scale-invariant New Physics Hypersurface (NPH) model of vacuum state modifications, as first proposed by Danielsson, in general models of single-field inflation. As compared to the power spectrum the bispectrum constraints are less ambiguous and provide an interesting upper bound on the cut-off scale in general models of single-field inflation with a small speed of sound. This upper bound is incompatible with the power spectrum constraint for most of the parameter domain, leaving very little room for minimal cut-off vacuum state modifications in general single-field models with a small speed of sound.
Cite
@article{arxiv.1009.5660,
title = {Minimal cut-off vacuum state constraints from CMB bispectrum statistics},
author = {P. Daniel Meerburg and Jan Pieter van der Schaar},
journal= {arXiv preprint arXiv:1009.5660},
year = {2011}
}
Comments
9 pages, 1 figure