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Speed of sound in cosmological phase transitions and effect on gravitational waves

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arxiv 2206.01130 v1 pith:2DGLAK4N submitted 2022-06-02 hep-ph astro-ph.CO

Speed of sound in cosmological phase transitions and effect on gravitational waves

classification hep-ph astro-ph.CO
keywords soundspeedgravitationalphasebudgetenergyordertransitions
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The energy budget for gravitational waves of a cosmological first order phase transitions depends on the speed of sound in the thermal plasma in both phases around the bubble wall. Working in the real-singlet augmented Standard Model, which admits a strong two-step electroweak phase transition, we compute higher order corrections to the pressure and sound speed. We compare our result to lower-order approximations to the sound speed and the energy budget and investigate the impact on the gravitational wave signal. We find that deviations in the speed of sound from $c_s^2 = 1/3$ are enhanced up to $\mathcal O(5\%)$ in our higher-order computation. This results in a suppression in the energy budget of up to $\mathcal O (50\%)$ compared to approximations assuming $c_s^2 = 1/3$. The effect is most significant for hybrid and detonation solutions. We generalise our discussion to the case of multiple inert scalars and the case of a reduced number of fermion families in order to mimic hypothetical dark sector phase transitions. In this sector with modified field content, the sound speed can receive significant suppression, with potential order-of-magnitude impact on the gravitational wave amplitude.

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Cited by 6 Pith papers

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