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 Invisible KL decays in the SM extensions

2016 ◽  
Vol 31 (25) ◽  
pp. 1650142 ◽  
Author(s):  
S. N. Gninenko ◽  
N. V. Krasnikov
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Higgs Doublet ◽  
New Physics ◽  
Doublet Model ◽  
Strong Motivation ◽  
Two Higgs Doublet Model ◽  
Near Future

In the Standard Model (SM), the branching ratio for the decay [Formula: see text] is helicity suppressed and predicted to be very small [Formula: see text]. We consider two natural extensions of the SM as the two-Higgs-doublet model (2HDM) and the neutrino minimal Standard Model ([Formula: see text]MSM) with additional singlet scalar, whose main feature is that they can lead to an enhanced [Formula: see text]. In the 2HDM, the smallness of the neutrino mass is explained due to the smallness of the second Higgs doublet vacuum expectation value. Moreover, the [Formula: see text]MSM extension with additional singlet field can explain the [Formula: see text] anomaly. The considered models demonstrate that the [Formula: see text] decay is a clean probe of new physics scale well above 100 TeV, that is complementary to rare [Formula: see text] decay, and provide a strong motivation for its sensitive search in a near future low-energy experiment.

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.

$B^0 - \bar B^0 $ MIXING IN A SUPERSYMMETRY-INSPIRED TWO HIGGS DOUBLET MODEL

1988 ◽  
Vol 03 (11) ◽  
pp. 1099-1105 ◽  
Author(s):  
AMITAVA RAYCHAUDHURI ◽  
SREERUP RAYCHAUDHURI
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Higgs Mass ◽  
Vacuum Expectation ◽  
Higgs Doublet ◽  
Top Quark Mass ◽  
Expectation Values ◽  
Charged Higgs ◽  
Doublet Model ◽  
Two Higgs Doublet Model

A supersymmetry-motivated two Higgs doublet model with equal vacuum expectation values for the two neutral Higgs and with a physical charged Higgs mass of 80–100 GeV is carefully examined in the context of its implications for [Formula: see text] mixing. Even with this conservative choice of Higgs parameters, the lower bound on the top quark mass coming from the ARGUS data is found to be considerably relaxed. An upper bound is also set, using results from CLEO and Mark II.

scholarly journals The $$R^2$$-Higgs inflation with two Higgs doublets

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
Sung Mook Lee ◽  
Tanmoy Modak ◽  
Kin-ya Oda ◽  
Tomo Takahashi
Keyword(s):  
Parameter Space ◽  
Linear Collider ◽  
Hadron Collider ◽  
International Linear Collider ◽  
Higgs Sector ◽  
Scalar Fields ◽  
Mass Range ◽  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model

AbstractWe study $$R^2$$ R 2 -Higgs inflation in a model with two Higgs doublets in which the Higgs sector of the Standard Model is extended by an additional Higgs doublet, thereby four scalar fields are involved in the inflationary evolutions. We first derive the set of equations required to follow the inflationary dynamics in this two Higgs doublet model, allowing a nonminimal coupling between the Higgs-squared and the Ricci scalar R, as well as the $$R^2$$ R 2 term in the covariant formalism. By numerically solving the system of equations, we find that, in parameter space where a successful $$R^2$$ R 2 -Higgs inflation are realized and consistent with low energy constraints, the inflationary dynamics can be effectively described by a single slow-roll formalism even though four fields are involved in the model. We also argue that the parameter space favored by $$R^2$$ R 2 -Higgs inflation requires nearly degenerate masses for $$m_{\mathsf {H}}$$ m H , $$m_A$$ m A and $$m_{{\mathsf {H}}^{\pm }}$$ m H ± , where $${\mathsf {H}}$$ H , A, and $${\mathsf {H}}^{\pm }$$ H ± are the extra CP even, CP odd, and charged Higgs bosons in the general two Higgs doublet model taking renormalization group evolutions of the parameters into account. Discovery of such heavy scalars at the Large Hadron Collider (LHC) are possible if they are in the sub-TeV mass range. Indirect evidences may also emerge at the LHCb and Belle-II experiments, however, to probe the quasi degenerate mass spectra one would likely require high luminosity LHC or future lepton colliders such as the International Linear Collider and the Future Circular Collider.

scholarly journals The extra scalar degrees of freedom from the two-Higgs doublet model for dark energy

2017 ◽  
Vol 26 (05) ◽  
pp. 1741003 ◽  
Author(s):  
Muhammad Usman ◽  
Asghar Qadir
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Particle Physics ◽  
Degrees Of Freedom ◽  
Higgs Doublet ◽  
Minimal Extension ◽  
The Standard Model ◽  
Doublet Model ◽  
Two Higgs Doublet Model ◽  
Higgs Fields

In principle, a minimal extension of the standard model of Particle Physics, the two-Higgs doublet model (2HDM), can be invoked to explain the scalar field responsible for dark energy. The two doublets are in general mixed. After diagonalization, the lightest CP-even Higgs and CP-odd Higgs are jointly taken to be the dark energy candidate. The dark energy obtained from the Higgs fields in this case is indistinguishable from the cosmological constant.

scholarly journals The Higgs field and the Jordan Brans Dicke cosmology

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Onder Dunya ◽  
Levent Akant ◽  
Metin Arik ◽  
Yelda Kardas ◽  
Selale Sahin ◽  
...  
Keyword(s):  
Massive Particle ◽  
Higgs Field ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Scalar Fields ◽  
Scale Factor ◽  
Point Of View ◽  
Nonlinear Sigma Model ◽  
Potential Term ◽  
The Universe

AbstractWe investigate a field theoretical approach to the Jordan–Brans–Dicke (JBD) theory extended with a particular potential term on a cosmological background by starting with the motivation that the Higgs field and the scale factor of the universe are related. Based on this relation, it is possible to come up with mathematically equivalent but two different interpretations. From one point of view while the universe is static, the masses of the elementary particles change with time. The other one, which we stick with throughout the manuscript, is that while the universe is expanding, particle masses are constant. Thus, a coupled Lagrangian density of the JBD field and the scale factor (the Higgs field), which exhibit a massive particle and a linearly expanding space in zeroth order respectively, is obtained. By performing a coordinate transformation in the field space for the reduced JBD action whose kinetic part is nonlinear sigma model, the Lagrangian of two scalar fields can be written as uncoupled for the Higgs mechanism. After this transformation, as a result of spontaneous symmetry breaking, the time dependent vacuum expectation value (vev) of the Higgs field and the Higgs bosons which are the particles corresponding to quantized oscillation modes about the vacuum, are found.

scholarly journals Symmetries of the 2HDM: an invariant formulation and consequences

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
P. M. Ferreira ◽  
B. Grzadkowski ◽  
O. M. Ogreid ◽  
P. Osland
Keyword(s):  
Renormalization Group ◽  
Necessary Conditions ◽  
Vacuum Expectation ◽  
Higgs Doublet ◽  
Physical Parameters ◽  
Expectation Values ◽  
Invariant Formulation ◽  
Sufficient And Necessary Conditions ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Abstract Symmetries of the Two-Higgs-Doublet Model (2HDM) potential that can be extended to the whole Lagrangian, i.e. the CP-symmetries CP1, CP2, CP3 and the Higgs-family symmetries Z2, U(1) and SO(3) are discussed. Sufficient and necessary conditions in terms of constraints on masses and physical couplings for the potential to respect each of these symmetries are found. Each symmetry can be realized through several alternative cases, each case being a set of relations among physical parameters. We will show that some of those relations are invariant under the renormalization group, but others are not. The cases corresponding to each symmetry group are illustrated by analyzing the interplay between the potential and the vacuum expectation values.

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