https://doi.org/10.1140/epjc/s10052-022-11077-3
Regular Article - Theoretical Physics
Cosmological phase transitions, gravitational waves and self-interacting dark matter in the singlet extension of MSSM
1
Faculty of Science, Beijing University of Technology, Beijing, People’s Republic of China
2
Department of Physics and Astronomy, University of Nebraska, 68588, Lincoln, NE, USA
3
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, People’s Republic of China
4
School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, People’s Republic of China
Received:
22
September
2022
Accepted:
24
November
2022
Published online:
11
December
2022
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.
© The Author(s) 2022
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