Electroweak baryogenesis and gravitational waves from a real scalar singlet

摘要

We consider a real scalar singlet field which provides a strong first-orderelectroweak phase transition via its coupling to the Higgs boson, and gives a$CP$ violating contribution on the top quark mass via a dimension-6 operator.We study the correlation between the baryon-to-entropy ratio produced byelectroweak baryogenesis, and the gravitational wave signal from theelectroweak phase transition. We show that future gravitational waveexperiments can test, in particular, the region of the model parameter spacewhere the observed baryon-to-entropy ratio can be obtained even if the newphysics scale, which is explicit in the dimension-6 operator, is high.