Electroweak phase transition in an extension of the standard model with a real Higgs singlet

Ham, S. W.; Jeong, Yu Seon; Oh, S. K.

doi:10.1088/0954-3899/31/8/017

Cited by 84 publications

(58 citation statements)

References 52 publications

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“…refs. [42,43,45,49,[108][109][110][111][112][113] and references therein). The arguments and methods we discuss here can be straightforwardly applied to other singlet extensions of the SM, such as the next-to-minimal supersymmetric Standard Model (nMSSM [31,32,41] or NMSSM [32, 38-40, 47, 48]) and other scenarios with real or complex gauge singlets [51].…”

Section: A Singlet-extended Higgs Sectormentioning

confidence: 99%

Bubble expansion and the viability of singlet-driven electroweak baryogenesis

Kozaczuk

2015

J. High Energ. Phys.

139

146

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The standard picture of electroweak baryogenesis requires slowly expanding bubbles. This can be difficult to achieve if the vacuum expectation value (VEV) of a gauge singlet scalar field changes appreciably during the electroweak phase transition. It is important to determine the bubble wall velocity in this case, since the predicted baryon asymmetry can depend sensitively on its value. Here, this calculation is discussed and illustrated in the real singlet extension of the Standard Model. The friction on the bubble wall is computed using a kinetic theory approach and including hydrodynamic effects. Wall velocities are found to be rather large (v w 0.2) but compatible with electroweak baryogenesis in some portions of the parameter space. If the phase transition is strong enough, however, a subsonic solution may not exist, precluding non-local electroweak baryogenesis altogether. The results presented here can be used in calculating the baryon asymmetry in various singlet-driven scenarios, as well as other features related to cosmological phase transitions in the early Universe, such as the resulting spectrum of gravitational radiation.

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Section: A Singlet-extended Higgs Sectormentioning

confidence: 99%

Bubble expansion and the viability of singlet-driven electroweak baryogenesis

Kozaczuk

2015

J. High Energ. Phys.

139

146

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“…Depending on the values of the model parameters the phase structure and the vacuum structure can be very rich. We shall not make a full EWPT analysis for this general model here, as it can be found from the literature [3,[28][29][30][31][32] (see also [33]). A thorough investigation of the potential structure, yielding a strong first order phase transition stemming already from the tree level potential, once the leading finite temperature terms are taken into account, was recently performed in [3].…”

Section: Sm + Real Singlet Scalarmentioning

confidence: 99%

First order electroweak phase transition from (non)conformal extensions of the standard model

Sannino

Virkajärvi

2015

Phys. Rev. D

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We analyse and compare the finite-temperature electroweak phase transition properties of classically (non)conformal extensions of the Standard Model. In the classically conformal scenarios the breaking of the electroweak symmetry is generated radiatively. The models feature new scalars coupled conformally to the Higgs sector as well as new fermions. We uncover the parameter space leading to a first-order phase transition with(out) the Veltman conditions. We also discuss dark (matter) aspects of some of the models and compare with existing literature when appropriate. We observe that to accommodate both, a first order electroweak phase transition, and a phenomenologically viable dark matter candidate requires to go beyond the simplest extensions of the Standard Model. Furthermore these extensions must all feature new degrees of freedom that are naturally lighter than a TeV and therefore the associated models are testable at the upcoming Large Hadron Collider run two experiments. * sannino@cp3-origins.net ¶ virkajarvi@cp3-origins.net arXiv:1505.05872v2 [hep-ph]

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“…Moreover, since the volume of plasma going through one symmetric bubble is very small compared to the size of the broken bubble at any time, V S (t) ≪ t 3 (see (38) and the discussion in section 5), it is only possible to obtain a sizable value of the filling factor Υ 1 if a large number of symmetric bubbles are nucleated inside each broken bubble. If only a few symmetric bubbles are nucleated per broken bubble, then Υ ≪ 1 andn B will be highly 12 While not shown explicitly, Υ depends on other phase transition parameters apart from T c .…”

Section: Growth Of Symmetric Bubblesmentioning

confidence: 99%

Supersonic electroweak baryogenesis: achieving baryogenesis for fast bubble walls

Caprini

2012

J. Cosmol. Astropart. Phys.

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Standard electroweak baryogenesis in the context of a first order phase transition is effective in generating the baryon asymmetry of the universe if the broken phase bubbles expand at subsonic speed, so that CP asymmetric currents can diffuse in front of the wall. Here we present a new mechanism for electroweak baryogenesis which operates for supersonic bubble walls. It relies on the formation of small bubbles of the symmetric phase behind the bubble wall, in the broken phase, due to the heating of the plasma as the wall passes by. We apply the mechanism to a model in which the Higgs field is coupled to several singlets, and find that enough baryon asymmetry is generated for reasonable values of the parameter space.

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Electroweak phase transition in an extension of the standard model with a real Higgs singlet

Cited by 84 publications

References 52 publications

Bubble expansion and the viability of singlet-driven electroweak baryogenesis

Bubble expansion and the viability of singlet-driven electroweak baryogenesis

First order electroweak phase transition from (non)conformal extensions of the standard model

Supersonic electroweak baryogenesis: achieving baryogenesis for fast bubble walls

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