PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Dark Matter
Phase transitions and gravitational waves in models of $\mathbb{Z_N}$ scalar dark matter
N. Benincasa,* K. Kannike, A. Hektor, A. Hryczuk, K. Loos
*corresponding author
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Pre-published on: June 10, 2020
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We study the nature of phase transitions and gravitational wave signals in models of scalar dark matter with $\mathbb{Z_N}$ symmetries. The scalar sector comprises the Standard Model Higgs, an Inert Doublet and a complex singlet. In such models, the dark matter relic density can be largely determined by semi-annihilations instead of usual annihilations, which reduces the direct detection signal. We perform a thorough study of the parameter space, investigating the impact of the quartic semi-annihilation couplings on the structure of potential minima, phase transitions, and possible enhancements of the stochastic gravitational wave signal.
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