Abstract
We study the dynamics of electroweak phase transition in a simple extension of the Standard Model where the Higgs sector is extended by adding an $SU(2)_L$-triplet with hypercharge Y=2. By making random scans over the parameters of the model, we show that there are regions consistent with constraints from collider experiments and the requirement for a strong first-order electroweak phase transition which is needed for electroweak baryogenesis. Further, we also study the power spectrum of the gravitational waves which can be generated due to the first-order phase transitions. Moreover, the detectability of these gravitational waves, via future space-based detectors, is discussed.
Highlights
A cosmological electroweak phase transition (EWPT) is interesting for numerous reasons
We have investigated the cosmological electroweak phase transition in an inert triplet scalar extension of the Standard Model (SM) model
We found that there are regions of parameter space that can both yield a strong first-order electroweak phase transition and be consistent with recent LHC results on the Higgs-to-diphoton decay rate
Summary
A cosmological electroweak phase transition (EWPT) is interesting for numerous reasons. About half a century ago, Sakharov proposed three early Universe conditions that must be satisfied for successful baryon asymmetry generation [8]: i) baryon number violation, ii) C and CP violation, and iii) a departure from thermal equilibrium These are in principle possible within the framework of an electroweak phase transition in the early Universe called electroweak baryogenesis (EWBG). The EWPT and its gravitational-wave signatures have been well studied within the framework of the singlet [12,13,14,15], doublet [16,17], and real triplet (Y 1⁄4 1) [17,18,19] cases of the scalar-multiplet class of models Another wellmotivated representation of the SUð2ÞL group is the complex triplet (Y 1⁄4 2), which could be used to explain the smallness of the neutrino mass in the type II seesaw mechanism [20,21,22]. IV and V we present numerical analyses of the model in light of the EWPT and gravitational-wave generation, respectively
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