Boosting GWs in Supersolid Inflation

Abstract

Inflation driven by a generic self-gravitating medium is an interesting alternative to study the impact of spontaneous spacetime symmetry breaking during a quasi de-Sitter phase, in particular the 4-dimensional diffeomorphism invariance of GR is spontaneously broken down to $ISO(3)$. The effective description is based on four scalar fields that describe the excitations of a supersolid. There are two phonon-like propagating scalar degrees of freedom that mix non-trivially both at early and late times and, after exiting the horizon, give rise to non-trivial correlations among the different scalar power spectra. The non-linear structure of the theory allows a secondary gravitational waves production during inflation, efficient enough to saturate the present experimental bound and with a blue-tilted spectral index.

arXiv comment32 pages, 8 figures. Few typos corrected and comments added

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Cited by in corpus (13)

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• Testing the Early Universe with Anisotropies of the Gravitational Wave Background
• Enhancing gravitational wave anisotropies with peaked scalar sources
• Cross-correlations as a Diagnostic Tool for Primordial Gravitational Waves
• Boosting GWs in Supersolid Inflation
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• Primordial tensor bispectra in $\mu$-CMB cross-correlations
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• Classical and Quantum Dynamics of Gyroscopic Systems and Dark Energy
• Evolution of perturbations in a universe with exotic solid-like matter