Gravitational Wave Signals of Pseudo-Goldstone Dark Matter in the ${\mathbb{Z}}_3$ Complex Singlet Model

Abstract

We study pseudo-Goldstone dark matter in the ${\mathbb{Z}}_3$ complex scalar singlet model. Because the direct detection spin-independent cross section is suppressed, such dark matter is allowed in a large mass range. Unlike in the original model stabilized by a parity, due to the cubic coupling of the singlet the ${\mathbb{Z}}_3$ model can accommodate first-order phase transitions that give rise to a stochastic gravitational wave signal potentially observable in future space-based detectors.

arXiv comment9 pages, 2 figures; citations added, Eq. (23) corrected, results unchanged

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