Speaker
Description
Strong first-order phase transitions (SFOPT), a necessary ingredient for the Electroweak Baryogenesis (EWBG) to incorporate the observed baryon asymmetry, can give rise to stochastic Gravitational Waves (GW). Understanding the sources of such primordial waves can complement the collider searches of new physics Beyond the Standard Model (BSM). In this work, we investigate the GW production from a two-component Dark Matter (DM) scenario by extending the Higgs sector of the Standard Model (SM) with a real scalar singlet and a hyperchrageless ($Y=0$) scalar triplet where the neutral part of the triplet acts as a DM candidate under a $Z_2$ symmetry. This setup is further extended with a Dirac fermion which transforms non-trivially under a $Z_2^{\prime}$ symmetry making it the second DM candidate. We find that the two DM particles can have masses that range from around $m_h/2$ to over the TeV scale, and significantly the $Y=0$ scalar triplet DM can be below TeV, which is otherwise ruled out as a single component DM unless its mass > 1.9 TeV. We highlight the interplay between cosmological and collider constraints, illustrating that a substantial portion of the parameter space, which eludes current limitations, is within the sensitivity range of future and current detectors such as Xenon1T, LZ-2022, or Darwin. Next, we investigate the FOPT dynamics in our current framework, and we find regions favouring a successful EWBG in the model parameter space that escapes all phenomenological constraints and remains consistent with DM relic and Direct Detection (DD) limits. We further estimate the gravitational wave signals arising from such SFOPT and observe that space-based future GW detectors such as LISA, BBO, DECIGO, and DECIGO-corr can probe the predicted GW spectrum. Our investigation complements the collider searches of BSM new physics at the DM and GW detector frontiers.
| Track type | Dark Matter |
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