Phase transition gravitational waves from pseudo-Nambu-Goldstone dark matter and two Higgs doublets

• Published in: The journal of high energy physics Vol. 2021; no. 5; pp. 1 - 31
• Main Authors: Zhang, Zhao, Cai, Chengfeng, Jiang, Xue-Min, Tang, Yi-Lei, Yu, Zhao-Huan, Zhang, Hong-Hao
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-05-2021; Springer Nature B.V; SpringerOpen
• Subjects: Beyond Standard Model; Classical and Quantum Gravitation; Cosmology of Theories beyond the SM; Dark matter; Electroweak model; Elementary Particles; Gravitational waves; Higgs Physics; High energy physics; Mathematical models; Parameters; Phase transitions; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Scalars; String Theory; Thermal Field Theory; Wave spectra; Cosmology of Theories beyond the SM; Beyond Standard Model; Higgs Physics; Thermal Field Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP05(2021)160

A
bstract
We investigate the potential stochastic gravitational waves from first-order electroweak phase transitions in a model with pseudo-Nambu-Goldstone dark matter and two Higgs doublets. The dark matter candidate can naturally evade direct detection bounds, and can achieve the observed relic abundance via the thermal mechanism. Three scalar fields in the model obtain vacuum expectation values, related to phase transitions at the early Universe. We search for the parameter points that can cause first-order phase transitions, taking into account the existed experimental constraints. The resulting gravitational wave spectra are further evaluated. Some parameter points are found to induce strong gravitational wave signals, which have the opportunity to be detected in future space-based interferometer experiments LISA, Taiji, and TianQin.