Abstract
We analyse a simple extension of the SM with just an additional scalar singlet coupled to the Higgs boson. We discuss the possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. We show that a large portion of the model parameter space exists where the observation of gravitational waves would allow detection while the indirect collider searches would not.
Highlights
This phase transition is not first-order in the SM [8, 9] and so a modification is needed to generate a barrier between the symmetric high temperature minimum and the electroweak symmetry breaking (EWSB) minimum as the universe cools down
We have studied the viability and detection prospects of a scalar singlet extension of the SM
We focused on two attractive features of this model, namely the possibility to facilitate EWBG and the DM candidate
Summary
In the early universe and at very high temperatures, thermal corrections to the scalar potential restore the electroweak symmetry. Due to the corrections from the new scalar, the electroweak minimum can be separated from the symmetric one at h = 0 by a potential barrier, thereby allowing a first-order phase transition that is absent in the SM [9]. The sphaleron processes present in the SM are connected with SU(2) gauge interactions and provide baryon number (B) violation necessary to create baryon-anti-baryon asymmetry. If they are not decoupled after the transition, they quickly wash-out any previously created asymmetry. As SU(2) interactions, they are heavily suppressed once the electroweak symmetry is broken This breaking is quantified by the Higgs VEV.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
