Gravitational wave signals of pseudo-Goldstone dark matter in the complex singlet model
Kristjan Kannike (National Institute of Chemical Physics and Biophysics, Rävala 10, Tallinn 10143, Estonia); Kaius Loos (National Institute of Chemical Physics and Biophysics, Rävala 10, Tallinn 10143, Estonia); Martti Raidal (National Institute of Chemical Physics and Biophysics, Rävala 10, Tallinn 10143, Estonia)
We study pseudo-Goldstone dark matter in the 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 and due to the cubic coupling of the singlet, the model can accommodate first-order phase transitions that give rise to a stochastic gravitational wave signal potentially observable in future space-based detectors.
