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arXiv · 2204.01928

Cosmological phase transitions, gravitational waves and self-interacting dark matter in the singlet extension of MSSM

Wenyu Wang·Ke-Pan Xie·Wu-Long Xu·Jin Min Yang
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Abstract

In the minimal supersymmetric standard model (MSSM) extended by a singlet superfield, when the coupling between the singlet sector and the MSSM sector is tiny, the singlet sector can be a quasi dark sector with supersymmetry (SUSY). We investigate the cosmological phenomena in this scenario and obtain the following observations: (i) In the parameter space solving the small cosmological scale anomalies via self-interacting singlino dark matter (SIDM), a first-order phase transition (FOPT) can readily happen but requires rather light dark matter below MeV; (ii) The corresponding parameter space indicated by FOPT and SIDM can be partially covered by detecting the phase-transition gravitational waves (GWs) at the near-future projects, such as LISA, TianQin and Taiji. Therefore, the recently developed GW astronomy could be a novel probe to such a SUSY scenario.

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Wenyu Wang, Ke-Pan Xie, Wu-Long Xu, Jin Min Yang. 2022-04-05. Cosmological phase transitions, gravitational waves and self-interacting dark matter in the singlet extension of MSSM. https://doi.org/10.1140/epjc/s10052-022-11077-3

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