Small-scale Tests of Inflation
Abstract
We investigate small-scale signatures of the inflationary particle content. We consider the case of a light spin-2 particle sourcing primordial gravitational waves by employing an effective field theory description. Upon allowing time-dependent sound speeds for the helicity modes, this setup delivers a blue tensor spectrum detectable, for example, by upcoming laser interferometers. Our focus is on the tensor non-Gaussianities that ensue from this field configuration. After characterising the bispectrum amplitude and shape-function at CMB scales, we move on to smaller scales where anisotropies induced in the tensor power spectrum by long-short modes coupling become the key handle on (squeezed) primordial non-Gaussianities. We identify the parameter space generating percent level anisotropies at scales soon to be probed by SKA and LISA.
Cite
@article{arxiv.2008.00452,
title = {Small-scale Tests of Inflation},
author = {Laura Iacconi and Matteo Fasiello and Hooshyar Assadullahi and David Wands},
journal= {arXiv preprint arXiv:2008.00452},
year = {2020}
}
Comments
24 pages, 15 figures. Version accepted for publication