Boosting GWs in Supersolid Inflation
2020
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 which describes the excitation of a supersolid. There are two phonon-like propagating scalar degrees of freedom that mix non-trivially both at early and late times after exiting the horizon giving 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.
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