Implication of GW170817 for Cosmological Bounces |
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Authors: | Gen Ye Yun-Song Piao |
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Institution: | 1.School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China2 Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China |
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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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Keywords: | cosmological bounce perturbation effective field theory singularity |
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