Implication of GW170817 for cosmological bounces

Gen Ye; Yun-Song Piao

Implication of GW170817 for cosmological bounces

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arxiv 1901.02202 v2 pith:WZ73LRIA submitted 2019-01-08 gr-qc astro-ph.COhep-th

Gen Ye , Yun-Song Piao This is my paper · ORCID

classification gr-qcastro-ph.COhep-th

keywords gw170817modelsspeedtheorybeyondbouncebouncesbuilding

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abstract

The detection of GW170817 and its electromagnetic counterpart has revealed the speed of gravitational waves coincides with the speed of light, $c_T=1$. Inspired by the possibility that the physics implied by GW170817 might be related with that for the primordial universe, we construct the spatially flat stable (throughout the whole evolution) nonsingular bounce models in the beyond Horndeski theory with $c_T=1$ and in the degenerate higher-order scalar-tensor (DHOST) theory with $c_T=1$, respectively. Though it constricts the space of viable models, the constraint of $c_T=1$ makes the procedure of building models simpler.

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Fully viable DHOST bounce with extra scalar
hep-th 2025-01 conditional novelty 6.0 of 10

A constructed two-field DHOST bouncing cosmology that avoids ghost, gradient, and superluminality problems and produces nearly scale-invariant curvature perturbations.

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