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

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http://hdl.handle.net/10138/321801

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Alanne , T , Benincasa , N , Heikinheimo , M , Kannike , K , Keus , V , Koivunen , N & Tuominen , K 2020 , ' Pseudo-Goldstone dark matter : gravitational waves and direct-detection blind spots ' , Journal of High Energy Physics , no. 10 , 80 . https://doi.org/10.1007/JHEP10(2020)080

Title: Pseudo-Goldstone dark matter : gravitational waves and direct-detection blind spots
Author: Alanne, Tommi; Benincasa, Nico; Heikinheimo, Matti; Kannike, Kristjan; Keus, Venus; Koivunen, Niko; Tuominen, Kimmo
Other contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics



Date: 2020-10-13
Language: eng
Number of pages: 31
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
DOI: https://doi.org/10.1007/JHEP10(2020)080
URI: http://hdl.handle.net/10138/321801
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.
Subject: Beyond Standard Model
Cosmology of Theories beyond the SM
MODEL
TOOLBOX
114 Physical sciences
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