Supercool subtleties of cosmological phase transitions

Athron, Peter; Balázs, Csaba; Morris, Lachlan

doi:10.48550/arxiv.2212.07559

Cited by 1 publication

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“…The percolation temperature is defined as the temperature in which F (T ) = 0.71 of the universe is covered by the false vacuum, and the existence of percolation temperature ensures the completion of phase transition [123,124]. The supercooling phase transition occurs when the nucleation temperature is considerably smaller than the nucleation temperature, which leads to α ≫ 1.…”

Section: Jcap07(2024)048mentioning

confidence: 99%

Gravitational wave signatures of a chiral fermion dark matter model

Abe,

Babu,

Kaladharan

2024

J. Cosmol. Astropart. Phys.

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Theories in which the dark matter (DM) candidate is a fermion transforming chirally under a gauge symmetry are attractive, as the gauge symmetry would protect the DM mass. In such theories, the universe would have undergone a phase transition at early times that generated the DM mass upon spontaneous breaking of the gauge symmetry. In this paper, we explore the gravitational wave signals of a simple such theory based on an SU(2)D dark sector with a dark isospin-3/2 fermion serving as the DM candidate. This is arguably the simplest chiral theory possible. The scalar sector consists of a dark isospin-3 multiple, which breaks the SU(2)D gauge symmetry and also generates the DM mass. We construct the full thermal potential of the model and identify regions of parameter space which lead to detectable gravitational wave signals, arising from a strong first-order SU(2)D phase transition, in various planned space-based interferometers, while also being consistent with dark matter relic abundance. The bulk of the parameter space exhibiting detectable gravitational wave signals in the model also has large WIMP-nucleon scattering cross sections, ℴSI, which could be probed in upcoming direct detection experiments.

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Section: Jcap07(2024)048mentioning

confidence: 99%