Pseudo-Goldstone dark matter: gravitational waves and direct-detection blind 
spots

Alanne, Tommi; Benincasa, Nico; Heikinheimo, Matti; Kannike, Kristjan; Keus, Venus; Koivunen, Niko; Tuominen, Kimmo

doi:10.1007/JHEP10(2020)080

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Pseudo-Goldstone dark matter: gravitational waves and direct-detection blind spots

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Alanne, Tommi
Florian Goertz - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Alanne, T., Benincasa, N., Heikinheimo, M., Kannike, K., Keus, V., Koivunen, N., et al. (2020). Pseudo-Goldstone dark matter: gravitational waves and direct-detection blind spots. Journal of high energy physics: JHEP, 2020(10): 80. doi:10.1007/JHEP10(2020)080.

Cite as: https://hdl.handle.net/21.11116/0000-0008-265E-5

Abstract

Pseudo-Goldstone dark matter is a thermal relic with momentum-suppressed direct-detection cross section. We study the most general model of pseudo-Goldstone dark matter arising from the complex-singlet extension of the Standard Model. The new U(1) symmetry of the model is explicitly broken down to a CP-like symmetry stabilising dark matter. We study the interplay of direct-detection constraints with the strength of cosmic phase transitions and possible gravitational-wave signals. While large U(1)-breaking interactions can generate a large direct-detection cross section, there are blind spots where the cross section is suppressed. We find that sizeable cubic couplings can give rise to a first-order phase transition in the early universe. We show that there exist regions of the parameter space where the resulting gravitational-wave signal can be detected in future by the proposed Big Bang Observer detector.