Beyond freeze-in: Dark matter via inverse phase transition and gravitational wave signal

0567316 - FZÚ 2023 RIV US eng J - Journal Article
Ramazanov, Sabir - Babichev, E. - Gorbunov, D. - Vikman, Alexander
Beyond freeze-in: Dark matter via inverse phase transition and gravitational wave signal.
Physical Review D. Roč. 105, č. 6 (2022), č. článku 063530. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA ČR(CZ) GJ20-16531Y; GA MŠMT EF15_003/0000437
Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institutional support: RVO:68378271
Keywords : gravitational radiation detector * tension * coupling constant * plasma
OECD category: Particles and field physics
Impact factor: 5, year: 2022
Method of publishing: Open access

We propose a novel scenario of dark matter production naturally connected with generation of gravitational waves. Dark matter is modeled as a real scalar, which interacts with the hot primordial plasma through a portal coupling to another scalar field. For a particular sign of the coupling, this system exhibits an inverse second order phase transition. The latter leads to an abundant dark matter production, even if the portal interaction is so weak that the freeze-in mechanism is inefficient. The model predicts domain wall formation in the Universe, a long time before the inverse phase transition. These domain walls have a tension decreasing with time and completely disappear at the inverse phase transition so that the problem of overclosing the Universe is avoided.
Permanent Link: https://hdl.handle.net/11104/0338578