Clustering Fossils in Solid Inflation

TL;DR

This paper investigates how solid inflation models violate the standard non-Gaussianity consistency condition, leading to observable clustering fossils in large-scale structures caused by long tensor perturbations, with potential detection in future surveys.

Contribution

It revisits bispectrum analysis in solid inflation, calculating quadrupole anisotropy effects from tensor perturbations within the allowed non-Gaussianity range, highlighting potential observational signatures.

Findings

Long tensor perturbations induce observable quadrupole anisotropy.

Clustering fossils from primordial gravitational waves could be detected in future surveys.

Solid inflation models can produce detectable large-scale structure imprints.

Abstract

In solid inflation the single field non-Gaussianity consistency condition is violated. As a result, the long tensor perturbation induces observable clustering fossils in the form of quardupole anisotropy in large scale structure power spectrum. In this work we revisit the bispectrum analysis for the scalar-scalar-scalar and tensor-scalar-scalar for the general parameter space of solid. We consider the parameter space of the model in which the level of non-Gaussianity generated is consistent with Planck constraints. Specializing to this allowed range of model parameter, we calculate the quadrupole anisotropy induced from the long tensor perturbations on the power spectrum of scalar perturbations. We argue that imprints of clustering fossil from primordial gravitational waves on large scale structures can be detected from the future galaxy surveys.