scholarly journals GENERATION OF SCALE INVARIANT DENSITY PERTURBATIONS IN A CONFORMALLY INVARIANT INERT HIGGS DOUBLET MODEL

2013 ◽  
Vol 28 (19) ◽  
pp. 1350094 ◽  
Author(s):  
MOUMITA DAS ◽  
SUBHENDRA MOHANTY
Keyword(s):  
Scalar Potential ◽  
Higgs Field ◽  
Density Perturbation ◽  
Coupled System ◽  
Higgs Doublet ◽  
Invariant Density ◽  
Scale Invariant ◽  
Conformally Invariant ◽  
Density Perturbations ◽  
Doublet Model

If a Higgs field is conformally coupled to gravity, then it can give rise to the scale invariant density perturbations. We make use of this result in a realistic inert Higgs doublet model, where we have a pair of Higgs doublets conformally coupled to the gravity in the early universe. The perturbation of the inert Higgs is shown to be the scale invariant. This gives rise to the density perturbation observed through CMB by its couplings to the standard model Higgs and the subsequent decay. Loop corrections of this conformally coupled system gives rise to electroweak symmetry breaking. We constrain the couplings of the scalar potential by comparing with the amplitude and spectrum of CMB anisotropy measured by WMAP and this model leads to a prediction for the masses of the lightest Higgs and the other scalars.

scholarly journals Fingerprinting the contribution of colored scalars to the $$H^+ W^- Z(\gamma )$$ vertex

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Nabarun Chakrabarty ◽  
Indrani Chakraborty ◽  
Dilip Kumar Ghosh
Keyword(s):  
Scalar Potential ◽  
Form Factors ◽  
Higgs Doublet ◽  
New Physics ◽  
Model Parameters ◽  
Minimal Flavour Violation ◽  
Color Octet ◽  
Flavour Violation ◽  
Doublet Model ◽  
Two Higgs Doublet Model

AbstractColor-octet scalars arise in various Grand Unification scenarios and also in other models of new physics. They are also postulated for minimal flavour violation. Purely phenomenological imprints of such scalars are therefore worth looking at. Motivated by this, we perform a complete one-loop calculation of the $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) decay in a two Higgs doublet model augmented by a color-octet $$SU(2)_L$$ S U ( 2 ) L scalar doublet. The computation is conveniently segregated into colorless and colored components. The color-octet part of the amplitude, being scaled by the color-factor, provides an overall enhancement to the form factors. Crucial constraints from perturbative unitarity, positivity of the scalar potential, oblique parameters, Higgs signal strengths and direct search of a charged Higgs and color-octet scalars are folded-in into the analysis. Sensitivity of the loop-induced $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) vertex to other model parameters is elucidated. Finally, the prospect of observing a loop-induced $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) interaction at the future hadronic collisions is also discussed.

scholarly journals Reparameterization of the scalar potential in the two Higgs doublet model

2006 ◽  
Vol 47 (3) ◽  
pp. 785-790
Author(s):  
Rodolfo A. Diaz ◽  
Viviana Dionicio ◽  
R. Martinez
Keyword(s):  
Scalar Potential ◽  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals Non-scale-invariant density perturbations from chaotic extended inflation

1992 ◽  
Vol 45 (6) ◽  
pp. 1961-1970 ◽  
Author(s):  
Silvia Mollerach ◽  
Sabino Matarrese
Keyword(s):  
Invariant Density ◽  
Scale Invariant ◽  
Density Perturbations

scholarly journals Collapsing domain walls in the two-Higgs-doublet model and deep insights from the EDM

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Ning Chen ◽  
Tong Li ◽  
Zhaolong Teng ◽  
Yongcheng Wu
Keyword(s):  
Cp Violation ◽  
Domain Wall ◽  
Domain Walls ◽  
Scalar Potential ◽  
Higgs Doublet ◽  
Big Bang ◽  
Doublet Model ◽  
Electron Edm ◽  
Two Higgs Doublet Model ◽  
The Big Bang

Abstract We study the domain wall solutions in the general two-Higgs-doublet model (2HDM) with a CP-violating phase. The 2HDM with the spontaneouse CP violation is found to have domain wall solutions whose tensions are $$ \mathcal{O} $$ O (106) GeV3, which are excluded by the Zel’dovich-Kobzarev-Okun bound. With the explicit CP-violating (CPV) terms as the so-called biased term in the scalar potential, domain walls can collapse in the early Universe. The sizes of the explicit CP violation can be constrained from the Big Bang nucleosynthesis. This constraint is converted to the CPV mixing of αc, and is mostly sensitive to the mass splittings between two heavy neutral Higgs bosons. We estimate the possible gravitational wave signals and the electric dipole moment (EDM) predictions due to the domain wall collapsing. It turns out that the peak spectrum of the GW from the domain wall collapsing cannot be probed in any future program. In contrast, the untenable regions with very tiny explicit CPV parameter in the Higgs potential has been partially excluded by the latest electron EDM measurements at the ACME-II and will be further confirmed or excluded by the future ACME-III projection.

scholarly journals Global fits in the Aligned Two-Higgs-Doublet model

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Otto Eberhardt ◽  
Ana Peñuelas Martínez ◽  
Antonio Pich
Keyword(s):  
Cp Violation ◽  
Scalar Potential ◽  
Higgs Doublet ◽  
Precision Measurements ◽  
Mixing Matrix ◽  
Doublet Model ◽  
Global Fit ◽  
Two Higgs Doublet Model ◽  
Electroweak Precision ◽  
Higgs Signal

Abstract We present the results of a global fit to the Aligned Two-Higgs Doublet Model, assuming that there are no new sources of CP violation beyond the quark mixing matrix. We use the most constraining flavour observables, electroweak precision measurements and the available data on Higgs signal strengths and collider searches for heavy scalars, together with the theoretical requirements of perturbativity and positivity of the scalar potential. The combination of all these constraints restricts the values of the scalar masses, the couplings of the scalar potential and the flavour-alignment parameters. The numerical fits have been performed using the open-source HEPfit package.

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