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- W4226103660 abstract "First-order phase transitions (FOPTs) are ubiquitous in physics beyond the Standard Model (SM). Recently, models with no dimensionful parameters in the tree-level action have been attracting much attention because they can predict a very strong FOPT with ultrasupercooling. In this paper, we study the cosmological signatures of such a supercooling model. As a concrete model, we consider the SM with two additional real scalars $ensuremath{phi}$ and $S$, which can realize the electroweak symmetry breaking via the Coleman-Weinberg mechanism. One of the additional scalars $S$ can naturally become a dark matter (DM) candidate due to the ${Z}_{2}$ symmetry of the action. We study the FOPT of this model and calculate the gravitational save (GW) signals and the thermal relic abundance of $S$ taking the filtered effects into account. Within the envelope approximation, we find that the GW peak amplitude can reach $ensuremath{sim}{10}^{ensuremath{-}10}$ around the frequency $fensuremath{sim}{10}^{ensuremath{-}3}text{ }text{ }mathrm{Hz}$ for model parameters $({v}_{ensuremath{phi}},{ensuremath{lambda}}_{ensuremath{phi}S})ensuremath{sim}(200text{ }text{ }mathrm{TeV},1.6)$ where ${v}_{ensuremath{phi}}$ is the vacuum expectation value of $ensuremath{phi}$ and ${ensuremath{lambda}}_{ensuremath{phi}S}$ is the scalar mixing coupling. On the other hand, the filtered DM mechanism only works for $0.8ensuremath{lesssim}{ensuremath{lambda}}_{ensuremath{phi}S}ensuremath{lesssim}1$, where the GW peak amplitude is found to be quite small $ensuremath{lesssim}{10}^{ensuremath{-}17}$." @default.
- W4226103660 created "2022-05-05" @default.
- W4226103660 creator A5070622339 @default.
- W4226103660 date "2022-05-12" @default.
- W4226103660 modified "2023-10-15" @default.
- W4226103660 title "Cosmology of a supercooled universe" @default.
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