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Gravitational waves and electroweak baryogenesis in a global study of the extended scalar singlet model
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University of Adelaide, Australia.
Number of Authors: 42019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 2, article id 183Article in journal (Refereed) Published
Abstract [en]

We perform a global fit of the extended scalar singlet model with a fermionic dark matter (DM) candidate. Using the most up-to-date results from the Planck measured DM relic density, direct detection limits from the XENON1T (2018) experiment, electroweak precision observables and Higgs searches at colliders, we constrain the 7-dimensional model parameter space. We also find regions in the model parameter space where a successful electroweak baryogenesis (EWBG) can be viable. This allows us to compute the gravitational wave (GW) signals arising from the phase transition, and discuss the potential discovery prospects of the model at current and future GW experiments. Our global fit places a strong upper and lower limit on the second scalar mass, the fermion DM mass and the scalar-fermion DM coupling. In agreement with previous studies, we find that our model can simultaneously yield a strong first-order phase transition and saturate the observed DM abundance. More importantly, the GW spectra of viable points can often be within reach of future GW experiments such as LISA, DECIGO and BBO.

Place, publisher, year, edition, pages
2019. no 2, article id 183
Keywords [en]
Beyond Standard Model, Higgs Physics, Spontaneous Symmetry Breaking, Thermal Field Theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-167659DOI: 10.1007/JHEP02(2019)183ISI: 000459963500004OAI: oai:DiVA.org:su-167659DiVA, id: diva2:1302195
Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-03Bibliographically approved

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