Abstract
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.
Highlights
Probe the early history of our universe
Using the most up-to-date results from the Planck measured dark matter (DM) relic density, direct detection limits from the XENON1T (2018) experiment, electroweak precision observables and Higgs searches at colliders, we constrain the 7dimensional model parameter space
We include the latest results from the Planck measured DM relic density [67], direct detection limits from the XENON1T (2018) experiment [68], electroweak precision observables (EWPO) [69] and Higgs searches at colliders [70, 71]
Summary
Probe the early history of our universe. With the current generation of direct DM searches, experiments are probing the DM-nucleon interaction with increasing sensitivity and placing strong limits on the allowed particle DM models. A potential barrier can be generated between the symmetric high-temperature minimum and the EWSB one as the universe cools down [20, 21] This leads to a strong first-order EWPT which can be probed using GWs and standard collider searches [22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42]. Appendices A, B, C and D provide supplementary details for understanding various expressions in the paper
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