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.

arXiv comment24 pages, 15 figures. Version accepted for publication

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Cited by in corpus (15)

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• Primordial gravitational waves from NANOGrav: a broken power-law approach
• PBHs and secondary GWs from ultra slow roll and punctuated inflation
• Probing Anisotropies of the Stochastic Gravitational Wave Background with LISA
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