scholarly journals No-scale gauge non-singlet inflation inducing TeV scale inverse seesaw mechanism

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Ahmad Moursy
Keyword(s):  
Gauge Symmetry ◽  
Parameter Space ◽  
Crucial Role ◽  
Essential Role ◽  
Mass Parameter ◽  
Susy Breaking ◽  
The Other ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Model Parameter

Abstract We develop a model of sneutrino inflation that is charged under U(1)B−L gauge symmetry, in no-scale supergravity framework. The model provides an interesting modification of tribrid inflation. We impose U(1)R symmetry on the renormalizable level while allow Planck suppressed non-renormalizable operators that break R-symmetry. This plays a crucial role in realizing a Starobinsly-like inflation scenario from one hand. On the other hand it plays an essential role, as well as SUSY breaking effects, in deriving the tiny neutrino masses via TeV inverse seesaw mechanism. Thus, we provide an interpretation for the extremely small value of the μS mass parameter required for inverse seesaw mechanism. We discuss a reheating scenario and possible constraints on the model parameter space in connection to neutrino masses.

scholarly journals ON GAUGE DYNAMICS AND SUSY BREAKING IN ORIENTIWORLD

2002 ◽  
Vol 17 (27) ◽  
pp. 3875-3895
Author(s):  
ZURAB KAKUSHADZE
Keyword(s):  
Crucial Role ◽  
Dimensional Space ◽  
Susy Breaking ◽  
Brane World ◽  
The Other ◽  
Quantum Level ◽  
Rich Variety ◽  
World Volume ◽  
The Standard Model ◽  
Dimensional Gravity

In the orientiworld framework the Standard Model fields are localized on D3-branes sitting on top of an orientifold three-plane. The transverse six-dimensional space is a noncompact orbifold (or a more general conifold). The four-dimensional gravity on D3-branes is reproduced due to the four-dimensional Einstein–Hilbert term induced at the quantum level. The orientifold three-plane plays a crucial role, in particular, without it the D3-brane world-volume theories would be conformal due to the tadpole cancellation. We study nonperturbative gauge dynamics in various [Formula: see text] supersymmetric orientiworld models based on the Z3 as well as Z5 and Z7 orbifold groups. Our discussions illustrate that there is a rich variety of supersymmetry preserving dynamics in some of these models. On the other hand, we also find some models with dynamical supersymmetry breaking.

U(1)B−L extension based on Δ(27) symmetry for lepton masses and mixings

2020 ◽  
Vol 35 (22) ◽  
pp. 2050181
Author(s):  
V. V. Vien ◽  
D. P. Khoi
Keyword(s):  
Standard Model ◽  
Neutrino Oscillation ◽  
The Other ◽  
Physical Parameters ◽  
Neutrino Masses ◽  
Type I ◽  
Seesaw Mechanism ◽  
Global Fit ◽  
Experimental Values ◽  
Best Fit

We propose a [Formula: see text] Standard Model (SM) extension based on [Formula: see text] symmetry in which neutrino mass orderings and the tiny neutrino masses are produced by the type-I seesaw mechanism. The obtained physical parameters are well consistent with the global fit of neutrino oscillation.1 The model is predictive in the sense that it reproduces the experimental values of neutrino parameters. Two of the predicted parameters have little deviations from the best-fit values given in Ref. 1, however they are consistent with the other experimental results.[Formula: see text]

scholarly journals Supersymmetric U(1)Y′⊗ U(1)B−L extension of the Standard Model

2017 ◽  
Vol 32 (16) ◽  
pp. 1750093 ◽  
Author(s):  
J. C. Montero ◽  
V. Pleitez ◽  
B. L. Sánchez-Vega ◽  
M. C. Rodriguez
Keyword(s):  
Gauge Symmetry ◽  
Mass Spectra ◽  
Tree Level ◽  
Neutrino Masses ◽  
Type I ◽  
Seesaw Mechanism ◽  
Active Neutrino ◽  
Supersymmetric Version ◽  
Fermion Masses ◽  
The Standard Model

We build a supersymmetric version with [Formula: see text] gauge symmetry, where [Formula: see text] is a new charge and [Formula: see text] and [Formula: see text] are the usual baryonic and leptonic numbers. The model has three right-handed neutrinos with identical [Formula: see text] charges, and can accommodate all fermion masses at the tree level. In particular, the type I seesaw mechanism is implemented for the generation of the active neutrino masses. We obtain the mass spectra of all sectors and for the scalar one we also give the flat directions allowed by the model.

scholarly journals Neutrino masses in a supersymmetric model with exotic right-handed neutrinos in global 𝒵3 ⊗ (B − L) symmetry

2021 ◽  
Vol 36 (02) ◽  
pp. 2150010
Author(s):  
M. C. rodriguez
Keyword(s):  
Experimental Data ◽  
The Other ◽  
Tree Level ◽  
Supersymmetric Model ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Mixing Angle ◽  
Neutrino Sector ◽  
Left Handed ◽  
The Right

We build a supersymmetric model with [Formula: see text] gauge symmetry, with a global [Formula: see text] symmetry. The [Formula: see text] symmetry is necessary to keep the proton stable at least at tree level. There is also a global [Formula: see text] symmetry, where [Formula: see text] and [Formula: see text] are the usual baryonic and leptonic numbers, respectively. We introduce three nonidentical right-handed neutrinos plus new scalars fields. After symmetry breaking, the right-handed neutrinos together with one left-handed neutrino get Majorana masses via the seesaw mechanism. The other two left-handed neutrinos get their Majorana masses at 1-loop level. We will also explain the mixing angle in the neutrino sector in agreement with the experimental data and we get several interesting candidates to the observed dark matter.

scholarly journals Gauged $$U(1)_{L_\mu -L_\tau }$$ scotogenic model in light of $$R_{K^{(*)}}$$ anomaly and AMS-02 positron excess

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Zhi-Long Han ◽  
Ran Ding ◽  
Su-Jie Lin ◽  
Bin Zhu
Keyword(s):  
Parameter Space ◽  
Gauge Boson ◽  
Comprehensive Analysis ◽  
Majorana Fermion ◽  
Neutrino Masses ◽  
Combined Analysis ◽  
Model Parameter ◽  
Loop Level ◽  
Scalar Singlet

AbstractWe study the gauged $$U(1)_{L_\mu -L_\tau }$$U(1)Lμ-Lτ scotogenic model with emphasis on latest measurement of LHCb $$R_{K^{(*)}}$$RK(∗) anomaly and AMS-02 positron excess. In this model, neutrino masses are induced at one-loop level with $$Z_2$$Z2-odd particles, i.e., right-handed neutrinos $$N_\ell (\ell =e,\mu ,\tau )$$Nℓ(ℓ=e,μ,τ) and inert scalar doublet $$\eta $$η inside the loop. Meanwhile, the gauged $$U(1)_{L_\mu -L_\tau }$$U(1)Lμ-Lτ symmetry is broken spontaneously by the scalar singlet S, resulting to the massive gauge boson $$Z'$$Z′. Provided certain couplings to quarks induced by heavy vector-like quarks, the gauge boson $$Z'$$Z′ would contribute to the transition $$b\rightarrow s \mu ^+\mu ^-$$b→sμ+μ-, hence explain the $$R_{K^{(*)}}$$RK(∗) anomaly. As for the Majorana fermion DM N, the gauge boson $$Z'$$Z′ and the singlet Higgs $$H_0$$H0 will generate various annihilation channels, among which the $$NN\rightarrow Z'Z'$$NN→Z′Z′ and $$NN\rightarrow Z'H_0(\rightarrow Z'Z')$$NN→Z′H0(→Z′Z′) channel could be used to interpret the AMS-02 positron excess. We give a comprehensive analysis on model parameter space with consider various current constraints. The combined analysis shows that the $$R_{K^{(*)}}$$RK(∗) anomaly and AMS-02 positron excess can be explained simultaneously.

scholarly journals Asymmetric matter from $$B-L$$ symmetry breaking

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Phung Van Dong ◽  
Duong Van Loi
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Early Universe ◽  
Higgs Field ◽  
Matter Content ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Normal Matter ◽  
The Universe ◽  
Asymmetric Matter

AbstractThe present matter content of our universe may be governed by a $$U(1)_{B-L}$$ U ( 1 ) B - L symmetry – the simplest gauge completion of the seesaw mechanism which produces small neutrino masses. The matter parity results as a residual gauge symmetry, implying dark matter stability. The Higgs field that breaks the $$B-L$$ B - L charge inflates the early universe successfully and then decays to right-handed neutrinos, which reheats the universe and generates both normal matter and dark matter manifestly.

scholarly journals DECIPHERING THE SEESAW NATURE OF NEUTRINO MASS FROM UNITARITY VIOLATION

2009 ◽  
Vol 24 (27) ◽  
pp. 2161-2165 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Neutrino Mass ◽  
Mass Matrix ◽  
The Other ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Seesaw Mechanism ◽  
Other Hand ◽  
Mixing Matrix

If neutrino masses are obtained via the canonical seesaw mechanism, based on an underlying 2 ×2 mass matrix, unitarity violation of the neutrino mixing matrix is unavoidable, but its effect is extremely small. On the other hand, in the inverse (and linear) seesaw mechanisms, based on an underlying 3 ×3 mass matrix, it can be significant and possibly observable. This 3 ×3 matrix is examined in more detail, and a new variation (the lopsided seesaw) is proposed which has features of both mechanisms. A concrete example based on U (1)N is discussed.

scholarly journals Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
B. Fu ◽  
S.F. King
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Parameter Space ◽  
High Energy ◽  
Low Energy ◽  
Dark Matter Candidate ◽  
Chiral Fermion ◽  
Seesaw Mechanism ◽  
Matter Production ◽  
Relic Abundance

Abstract We consider the possibility that dark matter is stabilised by a discrete Z2 symmetry which arises from a subgroup of a U(1)′ gauge symmetry, spontaneously broken by integer charged scalars, and under which the chiral quarks and leptons do not carry any charges. A chiral fermion χ with half-integer charge is odd under the preserved Z2, and hence becomes a stable dark matter candidate, being produced through couplings to right-handed neutrinos with vector-like U(1)′ charges, as in the type Ib seesaw mechanism. We calculate the relic abundance in such a low energy effective seesaw model containing few parameters, then consider a high energy renormalisable model with a complete fourth family of vector-like fermions, where the chiral quark and lepton masses arise from a seesaw-like mechanism. With the inclusion of the fourth family, the lightest vector-like quark can contribute to the dark matter production, enlarging the allowed parameter space that we explore.

scholarly journals Impact of leptonic unitarity and dark matter direct detection experiments on the NMSSM with inverse seesaw mechanism

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Junjie Cao ◽  
Yangle He ◽  
Yusi Pan ◽  
Yuanfang Yue ◽  
Haijing Zhou ◽  
...  
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Likelihood Function ◽  
Direct Detection ◽  
Upper Bounds ◽  
Dark Matter Candidate ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Yukawa Couplings ◽  
The Impact

Abstract In the Next-to-Minimal Supersymmetric Standard Model with the inverse seesaw mechanism to generate neutrino masses, the lightest sneutrino may act as a feasible dark matter candidate in vast parameter space. In this case, the smallness of the leptonic unitarity violation and the recent XENON-1T experiment can limit the dark matter physics. In particular, they set upper bounds of the neutrino Yukawa couplings λν and Yν. We study such effects by encoding the constraints in a likelihood function and carrying out elaborated scans over the parameter space of the theory with the Nested Sampling algorithm. We show that these constraints are complementary to each other in limiting the theory, and in some cases, they are very strict. We also study the impact of the future LZ experiment on the theory.

Initial Remedial Action to Coronavirus in India: a Study

2020 ◽  
Vol 16 ◽  
Author(s):  
Pooja ◽  
Karan Veer
Keyword(s):  
Artificial Intelligence ◽  
Developing Country ◽  
Crucial Role ◽  
Essential Role ◽  
Remedial Action ◽  
Indian States

Abstract:: Because of this pandemic COVID19 (now called SARS-CoV-2), few Indian states are now at the borderline to join the transmitting stage of the virus. The condition is troubling and new scientific, environmental and infrastructure needs to play a crucial role in removing this important problem globally (including India). It focused in this report on how India; a developing country is trying to stop corona spreading, and how artificial intelligence (AI) plays an essential role in controlling and monitoring the disease. The study also focuses on the topic and the challenges a developing country such as India faces.

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