Inert dark matter and strong electroweak phase transition

Abstract

The main virtue of the Inert Doublet Model (IDM) is that one of its spinless neutral bosons can play the role of Dark Matter. Assuming that the additional sources of CP violation are present in the form of higher dimensional operator(s) we reexamine the possibility that the model parameters for which the right number density of relic particles is predicted are compatible with the first order phase transition that could lead to electroweak baryogenesis.We find, taking into account recent indications from the LHC and the constraints from the electroweak precision data, that for a light DM (40-60 GeV) particle H 0 and heavy, almost degenerate additional scalars H ± and A 0 this is indeed possible but the two parameters most important for the strength of the phase transition: the common mass of H ± and A 0 and the trilinear coupling of the Higgs-like particle h 0 to DM are strongly constrained. H ± and A 0 must weight less than ∼ 440 GeV if the inert minimum is to be the lowest one and the value of the h 0 H 0 H 0 coupling is limited by the XENON 100 data. We stress the important role of the zero temperature part of the potential for the strength of the phase transition.PACS numbers:12.60. Fr, 12.15.Ji, 98.80.Cq, 95.35.+d

Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

“…The strength of the EWPT can be improved if new bosonic degrees of freedom are invoked [52][53][54][55], which is the case we are investigating. It is clear from Eq.…”

Electroweak baryogenesis and dark matter from a singlet Higgs

“…A natural scenario for potentially achieving both simultaneously is scalar dark matter S that couples to the Higgs field H through the renormalizable interaction λ m |H| 2 S 2 . The case where the new scalar is another SU(2) L doublet (the inert doublet model model [1]- [16]) has recently been studied in this context [17]- [19], where working examples were found, at the expense of some tuning of parameters in order to sufficiently suppress the relic density to satisfy direct detection constraints while getting a strong electroweak phase transition (EWPT). 1 The case of singlet S dark matter [20]- [34] has also been considered with respect to its impact on the electroweak phase transition in refs.…”

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.…”