Unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures

Chala, Mikael; Nardini, Germano; Sobolev, Ivan (2016). Unified explanation for dark matter and electroweak baryogenesis with direct detection and gravitational wave signatures. Physical review. D - particles, fields, gravitation, and cosmology, 94(5), 055006. American Physical Society 10.1103/PhysRevD.94.055006

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A minimal extension of the Standard Model that provides both a dark matter candidate and a strong first-order electroweak phase transition (EWPT) consists of two additional Lorentz and gauge singlets. In this paper we work out a composite Higgs version of this scenario, based on the coset SO(7)/SO(6). We show that by embedding the elementary fermions in appropriate representations of SO(7), all dominant interactions are described by only three free effective parameters. Within the model dependencies of the embedding, the theory predicts one of the singlets to be stable and responsible for the observed dark matter abundance. At the same time, the second singlet introduces new CP-violation phases and triggers a strong first-order EWPT, making electroweak baryogenesis feasible. It turns out that this scenario does not conflict with current observations and it is promising for solving the dark matter and baryon asymmetry puzzles. The tight predictions of the model will be accessible at the forthcoming dark matter direct detection and gravitational wave experiments.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Nardini, Germano

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

30 Sep 2016 08:32

Last Modified:

30 Sep 2016 08:32

Publisher DOI:

10.1103/PhysRevD.94.055006

ArXiv ID:

1605.08663

BORIS DOI:

10.7892/boris.88726

URI:

https://boris.unibe.ch/id/eprint/88726

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