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

Alanne, Tommi ORCID: 0000-0002-3806-7652, Benincasa, Nico, Heikinheimo, Matti, Kannike, Kristjan, Keus, Venus, Koivunen, Niko and Tuominen, Kimmo
(2020) Pseudo-Goldstone dark matter: gravitational waves and direct-detection blind spots. JOURNAL OF HIGH ENERGY PHYSICS, 10 (10). 080-.

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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.

Item Type: Article
Additional Information: 32 pages, 11 figures, published version
Uncontrolled Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM
Depositing User: Symplectic Admin
Date Deposited: 19 Oct 2020 14:51
Last Modified: 18 Jan 2023 23:27
DOI: 10.1007/JHEP10(2020)080
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