Gravitational waves as a probe of extended scalar sectors with the first order electroweak phase transition

Abstract

We discuss spectra of gravitational waves which are originated by the strongly first order phase transition at the electroweak symmetry breaking, which is required for a successful scenario of electroweak baryogenesis. Such spectra are numerically evaluated without high temperature expansion in a set of extended scalar sectors with additional N isospin-singlet fields as a concrete example of renormalizable theories. We find that the produced gravitational waves can be significant, so that they are detectable at future gravitational wave interferometers such as DECIGO and BBO. Furthermore, since the spectra strongly depend on N and the mass of the singlet fields, our results indicate that future detailed observation of gravitational waves can be in general a useful probe of extended scalar sectors with the first order phase transition.

Gravitational waves from hidden QCD phase transition

“…However, if the SM is extended, observable GW signals associated with a symmetry breaking may be produced and tested in future experiments such as LISA [12,13] and DECIGO [14][15][16] as discussed in [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Synergy between measurements of gravitational waves and the triple-Higgs coupling in probing the first-order electroweak phase transition

“…With the mass of the discovered Higgs boson being 125 GeV, strongly 1stOPT cannot occur in the framework of the SM Higgs sector. However, by extending the Higgs sector with additional scalar fields, strongly 1stOPT can be easily realized [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. In order to unveil the mechanism of EWBG, one needs to identify the shape of the Higgs potential and the dynamics of the EWSB.…”

Gravitational waves from the first order electroweak phase transition in the Z3 symmetric singlet scalar model

“…But generically the absence of mixing renders the tests at colliders difficult without taking enough large λ sh coupling as discussed in Refs. [13,15,16,22,25]. In this paper, we have focused on such the nightmare scenario in the Z 3 symmetric single scalar model.…”