scholarly journals Baryogenesis within the two-Higgs-doublet model in the electroweak scale

2014 ◽  
Vol 29 (20) ◽  
pp. 1450090 ◽  
Author(s):  
M. Ahmadvand
Keyword(s):  
Phase Transition ◽  
Higgs Field ◽  
Higgs Doublet ◽  
Electroweak Scale ◽  
First Order Phase Transition ◽  
True Vacuum ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model ◽  
First Order Phase

The conventional baryogenesis mechanism is based on the one Higgs doublet within the Standard Model, at the electroweak scale T ~ 100 GeV . In this model, the strong first-order phase transition due to the spontaneous symmetry breaking imposes the following condition on the mass of the Higgs field: mH ≲ 40 GeV , which is contrary to the recently observed value mH ≃ 126 GeV . In this paper, we propose a baryogenesis mechanism within a two-Higgs-doublet model in which the phase transition occurs in one stage. This model is consistent with the observed mass of the Higgs. We obtain the true vacuum bubble wall velocity and thickness in this model. Then, we use nonlocal baryogenesis mechanism in which the interaction of fermions with the boundary of the expanding bubbles leads to CP violation and sphaleron mediated baryogenesis.

scholarly journals Effects of 2HDM in Electroweak Phase Transition

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 45
Author(s):  
Arnab Chaudhuri ◽  
Maxim Yu. Khlopov ◽  
Shiladitya Porey
Keyword(s):  
Phase Transition ◽  
Entropy Production ◽  
Higgs Doublet ◽  
Minimal Extension ◽  
Electroweak Phase Transition ◽  
First Order ◽  
First Order Phase Transition ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
First Order Phase

The entropy production scenarios due to the electroweak phase transition (EWPT) in the framework of the minimal extension of standard model, namely the two Higgs doublet model (2HDM), are revisited. The possibility of first order phase transition is discussed. Intense parameter scanning was done with the help of BSMPT, a C++ package. We perform numerical calculations in order to calculate the entropy production with numerous benchmark points.

Dark energy from nondegenerate Higgs-vacuum

2019 ◽  
Vol 28 (16) ◽  
pp. 2040008
Author(s):  
Muhammad Usman ◽  
Asghar Qadir
Keyword(s):  
Dark Energy ◽  
Higgs Field ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Scalar Fields ◽  
Higgs Doublet ◽  
Late Time ◽  
True Vacuum ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Scalar fields are favorite among the possible candidates for the dark energy. Most frequently discussed are those with degenerate minima at [Formula: see text]. In this paper, a slightly modified two-Higgs doublet model is taken to contain the Higgs field(s) as the dark energy candidate(s). The model considered has two nondegenerate minima at [Formula: see text], instead of one degenerate minimum at [Formula: see text]. The component fields of one SU(2) doublet ([Formula: see text]) act as the standard model (SM) Higgs, while the component fields of the second doublet ([Formula: see text]) are taken to be the dark energy candidates (lying in the true vacuum). It is found that one can arrange for late time acceleration (dark energy) by using an SU(2) Higgs doublet, whose vacuum expectation value is zero, in the quintessential regime.

scholarly journals Interplay of New Physics effects in (g − 2)ℓ and h → ℓ+ℓ− — lessons from SMEFT

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Svjetlana Fajfer ◽  
Jernej F. Kamenik ◽  
M. Tammaro
Keyword(s):  
Closed Operator ◽  
Higgs Doublet ◽  
New Physics ◽  
Effective Field ◽  
Tree Level ◽  
Electroweak Symmetry ◽  
Scalar Leptoquark ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model

Abstract We explore the interplay of New Physics (NP) effects in (g− 2)ℓ and h→ℓ+ℓ− within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and SU(2)L gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the (g−2)ℓ and h→ℓ+ℓ− contributions obtained by the complete one- and even two-loop calculations in the full models.

ONE LOOP-INDUCED WZH COUPLING IN THE TWO HIGGS DOUBLET MODEL

1989 ◽  
Vol 04 (28) ◽  
pp. 2757-2766 ◽  
Author(s):  
THOMAS G. RIZZO
Keyword(s):  
Standard Model ◽  
Higgs Doublet ◽  
New Physics ◽  
Tree Level ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Charged Higgs ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model

Although absent at the tree level in models with only doublet and singlet Higgs representations, the WZH coupling can be induced at the one-loop level. We examine the size of this induced coupling in the two Higgs doublet model due to fermion as well as Higgs/gauge boson loops. Such couplings could provide a new mechanism for charged Higgs production at colliders and are ‘backgrounds’ to new physics beyond the Standard Model. We find, however, that these couplings are very weak for all regions of the parameter space explored.

FIRST ORDER PHASE TRANSITIONS, WHEN AND FROM WHERE DO THEY EMERGE? —THE CASE OF GELS

1995 ◽  
Vol 09 (07) ◽  
pp. 737-749 ◽  
Author(s):  
KEN SEKIMOTO
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Transition Point ◽  
The Other ◽  
Basic Fact ◽  
Theoretical Understanding ◽  
First Order ◽  
First Order Phase Transition ◽  
The One ◽  
First Order Phase

We briefly review the recent theoretical understanding of the first order phase transition undergone by gels with an emphasis on physical concepts, deliberately excluding details of modeling and analytic methods. The density of a gel changes discontinuously at the transition point. A variety of features of the transition result from the basic fact that the inhomogeneity of the density of the gel inevitably causes shear deformation. This deformation, on the one hand, reflects the geometry of the sample and, on the other hand, may alter the transition temperature.

Phase transitions and topological defects

2018 ◽  
Author(s):  
Michael Kachelriess
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Early Universe ◽  
Topological Defects ◽  
False Vacuum ◽  
First Order ◽  
Broken Symmetries ◽  
First Order Phase Transition ◽  
True Vacuum ◽  
First Order Phase

As the early universe cools down, it may perform transitions to phases with more and more broken symmetries. In a first-order phase transition, fields may be trapped in the false vacuum; the rate of the resulting tunneling process to the true vacuum is derived. Phase transitions can lead also to the formation of topological defects. Their structure and the reason for their stability are discussed.

scholarly journals THE TYPE OF THE PHASE TRANSITION AND COUPLING VALUES IN λϕ4 MODEL

2012 ◽  
Vol 27 (21) ◽  
pp. 1250116 ◽  
Author(s):  
M. BORDAG ◽  
V. DEMCHIK ◽  
A. GULOV ◽  
V. SKALOZUB
Keyword(s):  
Phase Transition ◽  
Monte Carlo Simulation ◽  
Coupling Constant ◽  
Huge Amount ◽  
Simulation Data ◽  
First Order ◽  
First Order Phase Transition ◽  
Cluster A ◽  
The One ◽  
First Order Phase

The temperature induced phase transition is investigated in the one-component scalar field ϕ4 model on the lattice. Using the GPU cluster a huge amount of Monte Carlo simulation data is collected for a wide interval of coupling values. This gives a possibility to determine the low bound on the coupling constant λ0 when the transition happens and investigate its type. We found that for the values of λ close to this bound a weak-first-order phase transition takes place. It converts into a second-order one with the increase of λ. A comparison with the results obtained in analytic and numeric calculations by other authors is given.

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