scholarly journals Neutrino mass, leptogenesis and sterile neutrino dark matter in inverse seesaw framework

2021 ◽  
pp. 2150146
Author(s):  
Nayana Gautam ◽  
Mrinal Kumar Das
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Parameter Space ◽  
Sterile Neutrino ◽  
Baryon Asymmetry ◽  
Inverted Hierarchy ◽  
Lepton Asymmetry ◽  
The Standard Model ◽  
Active Mixing ◽  
The Universe

We study [Formula: see text] flavor symmetric inverse seesaw model which has the possibility of simultaneously addressing neutrino phenomenology, dark matter (DM) and baryon asymmetry of the universe (BAU) through leptogenesis. The model is the extension of the standard model by the addition of two (RH) neutrinos and three sterile fermions leading to a keV scale sterile neutrino DM and two pairs of quasi-Dirac states. The CP violating decay of the lightest quasi-Dirac pair present in the model generates lepton asymmetry which then converts to BAU. Thus, this model can provide a simultaneous solution for nonzero neutrino mass, DM content of the universes and the observed baryon asymmetry. The [Formula: see text] flavor symmetry in this model is augmented by additional [Formula: see text] symmetry to constrain the Yukawa Lagrangian. A detailed numerical analysis has been carried out to obtain DM mass, DM-active mixing as well as BAU both for normal hierarchy as well as inverted hierarchy. We try to correlate the two cosmological observables and found a common parameter space satisfying the DM phenomenology and BAU. The parameter space of the model is further constrained from the latest cosmological bounds on the observables.

scholarly journals THE PHENOMENOLOGY OF RIGHT HANDED NEUTRINOS

2013 ◽  
Vol 22 (08) ◽  
pp. 1330019 ◽  
Author(s):  
MARCO DREWES
Keyword(s):  
Dark Matter ◽  
Particle Physics ◽  
Laboratory Experiments ◽  
Recent Progress ◽  
Sterile Neutrino ◽  
Baryon Asymmetry ◽  
Left Handed ◽  
The Standard Model ◽  
Theoretical Considerations ◽  
The Universe

Neutrinos are the only particles in the Standard Model (SM) of particle physics that have only been observed with left handed chirality to date. If right handed (RH) neutrinos exist, they could be responsible for several phenomena that have no explanation within the SM, including neutrino oscillations, the baryon asymmetry of the universe, dark matter (DM) and dark radiation (DR). After a pedagogical introduction, we review recent progress in the phenomenology of RH neutrinos. We in particular discuss the mass ranges suggested by hints for neutrino oscillation anomalies and DR (eV), sterile neutrino DM scenarios (keV) and experimentally testable theories of baryogenesis (GeV to TeV). We summarize constraints from theoretical considerations, laboratory experiments, astrophysics and cosmology for each of these.

scholarly journals Finding New Physics, Phenomenological, Experimental, and Astrophysical Predictions from Neutrino Mass

2020 ◽  
Author(s):  
Chitta Ranjan Das ◽  
Katri Huitu ◽  
Zhanibek Kurmanaliyev ◽  
Bakytbek Mauyey ◽  
Timo Kärkkäinen
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Early Universe ◽  
Neutrino Mass ◽  
New Physics ◽  
Mass Scale ◽  
Baryon Asymmetry ◽  
Neutrino Masses ◽  
The Standard Model ◽  
The Universe

The crucial phenomenological and experimental predictions for new physics are outlined, where the number of problems of the Standard Model (neutrino masses and oscillations, dark matter, baryon asymmetry of the Universe, leptonic CP-violation) could find their solutions. The analogies between the cosmological neutrino mass scale from the early universe data and laboratory probes are discussed and the search for new physics and phenomena.

scholarly journals A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Partha Konar ◽  
Ananya Mukherjee ◽  
Abhijit Kumar Saha ◽  
Sudipta Show
Keyword(s):  
Dark Matter ◽  
Thermal History ◽  
Direct Detection ◽  
Critical Role ◽  
Mass Term ◽  
Baryon Asymmetry ◽  
Dark Sector ◽  
Lepton Asymmetry ◽  
History Of ◽  
The Universe

Abstract We propose an appealing alternative scenario of leptogenesis assisted by dark sector which leads to the baryon asymmetry of the Universe satisfying all theoretical and experimental constraints. The dark sector carries a non minimal set up of singlet doublet fermionic dark matter extended with copies of a real singlet scalar field. A small Majorana mass term for the singlet dark fermion, in addition to the typical Dirac term, provides the more favourable dark matter of pseudo-Dirac type, capable of escaping the direct search. Such a construction also offers a formidable scope to radiative generation of active neutrino masses. In the presence of a (non)standard thermal history of the Universe, we perform the detailed dark matter phenomenology adopting the suitable benchmark scenarios, consistent with direct detection and neutrino oscillations data. Besides, we have demonstrated that the singlet scalars can go through CP-violating out of equilibrium decay, producing an ample amount of lepton asymmetry. Such an asymmetry then gets converted into the observed baryon asymmetry of the Universe through the non-perturbative sphaleron processes owing to the presence of the alternative cosmological background considered here. Unconventional thermal history of the Universe can thus aspire to lend a critical role both in the context of dark matter as well as in realizing baryogenesis.

scholarly journals Predictive S4 flavon model with TM1 mixing and baryogenesis through leptogenesis

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Mainak Chakraborty ◽  
R. Krishnan ◽  
Ambar Ghosal
Keyword(s):  
Neutrino Mass ◽  
Parameter Space ◽  
Mass Matrix ◽  
Mass Scale ◽  
Baryon Asymmetry ◽  
Approximate Analytic Solution ◽  
Boltzmann Equations ◽  
Majorana Neutrinos ◽  
Cp Symmetry ◽  
The Universe

Abstract We use S4 discrete group to construct a neutrino flavour model which leads to T M1 mixing and is consistent with the neutrino oscillation data. Using the model’s constrained parameter space, we predict the values of Dirac C P phase and the light neutrino mass as −1 < sin δ < −0.9 and 1.7 < m1(meV) < 5.5 respectively. We thoroughly examine the usefulness of this model in explaining the observed baryon asymmetry of the Universe. Near-maximal breaking of CP symmetry (arising due to the TM1 constraint) helps us in generating adequate baryon asymmetry through leptogenesis. We study the evolution of the asymmetry (generated due to the decay of the heavy Majorana neutrinos) starting from the primordial Universe in two different ways (i)explicitly solving network of Boltzmann equations, (ii) using approximate analytic solution and we have shown the extent of their equivalence. Nearly accurate analytical fits are used thereafter to evaluate baryon asymmetry for the whole parameter space allowed by 3σ global fit of oscillation data and to impose a constraint on the yet unbounded mass scale parameter of Dirac neutrino mass matrix. Furthermore, significant contribution of N2 decay in the context of flavoured leptogenesis is also estimated.

scholarly journals Lepton-mediated electroweak baryogenesis, gravitational waves and the 4τ final state at the collider

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Ke-Pan Xie
Keyword(s):  
Phase Transition ◽  
Gravitational Waves ◽  
Parameter Space ◽  
Baryon Asymmetry ◽  
Hadron Colliders ◽  
Electroweak Phase Transition ◽  
Final State ◽  
First Order ◽  
The Standard Model ◽  
The Universe

Abstract An electroweak baryogenesis (EWBG) mechanism mediated by τ lepton transport is proposed. We extend the Standard Model with a real singlet scalar S to trigger the strong first-order electroweak phase transition (SFOEWPT), and with a set of leptophilic dimension-5 operators to provide sufficient CP violating source. We demonstrate this model is able to generate the observed baryon asymmetry of the universe. This scenario is experimentally testable via either the SFOEWPT gravitational wave signals at the next-generation space-based detectors, or the pp → h* → SS → 4τ process (where h* is an off-shell Higgs) at the hadron colliders. A detailed collider simulation shows that a considerable fraction of parameter space can be probed at the HL-LHC, while almost the whole parameter space allowed by EWBG can be reached by the 27 TeV HE-LHC.

scholarly journals SMART U(1)$$_X$$: standard model with axion, right handed neutrinos, two Higgs doublets and U(1)$$_X$$ gauge symmetry

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Nobuchika Okada ◽  
Digesh Raut ◽  
Qaisar Shafi
Keyword(s):  
Dark Matter ◽  
Gauge Symmetry ◽  
Domain Wall ◽  
Standard Model ◽  
Particle Physics ◽  
Inflection Point ◽  
Baryon Asymmetry ◽  
Grand Unification ◽  
The Standard Model ◽  
The Universe

AbstractTo address five fundamental shortcomings of the Standard Model (SM) of particle physics and cosmology, we propose a phenomenologically viable framework based on a $$U(1)_X \times U(1)_{PQ}$$ U ( 1 ) X × U ( 1 ) PQ extension of the SM, that we call “SMART U(1)$$_X$$ X ”. The $$U(1)_X$$ U ( 1 ) X gauge symmetry is a well-known generalization of the $$U(1)_{B-L}$$ U ( 1 ) B - L symmetry and $$U(1)_{PQ}$$ U ( 1 ) PQ is the global Peccei–Quinn (PQ) symmetry. Three right handed neutrinos are added to cancel $$U(1)_X$$ U ( 1 ) X related anomalies, and they play a crucial role in understanding the observed neutrino oscillations and explaining the observed baryon asymmetry in the universe via leptogenesis. Implementation of PQ symmetry helps resolve the strong CP problem and also provides axion as a compelling dark matter (DM) candidate. The $$U(1)_X$$ U ( 1 ) X gauge symmetry enables us to implement the inflection-point inflation scenario with $$H_{inf} \lesssim 2 \times 10^{7}$$ H inf ≲ 2 × 10 7  GeV, where $$H_{inf}$$ H inf is the value of Hubble parameter during inflation. This is crucial to overcome a potential axion domain wall problem as well as the axion isocurvature problem. The SMART U(1)$$_X$$ X framework can be successfully implemented in the presence of SU(5) grand unification, as we briefly show.

scholarly journals Dark photon dark matter in the minimal B − L model

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Gong jun Choi ◽  
Tsutomu T. Yanagida ◽  
Norimi Yokozaki
Keyword(s):  
Dark Matter ◽  
Gauge Boson ◽  
Baryon Asymmetry ◽  
Minimal Set ◽  
Complex Scalar ◽  
Seesaw Mechanism ◽  
Dark Photon ◽  
The Standard Model ◽  
Set Up ◽  
The Universe

Abstract The extension of the Standard model (SM) with three heavy right handed neutrinos, a complex scalar and the gauged U(1)B−L symmetry (the minimal B − L model) is considered the most compelling minimal one: the presence and the out-of-equilibrium decay of the heavy right handed neutrinos can account for the small masses of the active neutrinos and the baryon asymmetry of the universe. A natural accompanying question concerns whether the minimal B − L model can naturally accommodate an interesting dark matter (DM) candidate. We study the possibility where the current DM population is explained by the gauge boson of U(1)B−L symmetry. We discuss how the minimal set-up originally aimed at the seesaw mechanism and the leptogenesis is connected to conditions making the gauge boson promoted to a DM candidate.

scholarly journals Search for Hidden Particles in Intensity Frontier Experiment SHiP

2019 ◽  
Vol 64 (8) ◽  
pp. 689
Author(s):  
V. M. Gorkavenko
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Particle Physics ◽  
Neutrino Oscillations ◽  
New Physics ◽  
Baryon Asymmetry ◽  
Heavy Particles ◽  
The Standard Model ◽  
The Future ◽  
The Universe

Despite the undeniable success of the Standard Model of particle physics (SM), there are some phenomena (neutrino oscillations, baryon asymmetry of the Universe, dark matter, etc.) that SM cannot explain. This phenomena indicate that the SM have to be modified. Most likely, there are new particles beyond the SM. There are many experiments to search for new physics that can be can divided into two types: energy and intensity frontiers. In experiments of the first type, one tries to directly produce and detect new heavy particles. In experiments of the second type, one tries to directly produce and detect new light particles that feebly interact with SM particles. The future intensity frontier SHiP experiment (Search for Hidden Particles) at the CERN SPS is discussed. Its advantages and technical characteristics are given.

scholarly journals Baryogenesis in the vMSM: recent developments

2018 ◽  
Vol 191 ◽  
pp. 08001
Author(s):  
Inar Timiryasov
Keyword(s):  
Standard Model ◽  
Parameter Space ◽  
Recent Progress ◽  
Baryon Asymmetry ◽  
The Standard Model ◽  
Recent Developments ◽  
The Asymmetry ◽  
The Universe

Extension of the Standard Model with two right-handed neutrinos provides an economic and testable explanation of the origin of the baryon asymmetry of the Universe. We review recent progress in understanding dynamics of the asymmetry generation. We also present results of a new study of the parameter space of the model. These results demonstrate that the region of the parameter space in which the observed value of baryon asymmetry can be reproduced is larger than it was previously obtained.

scholarly journals SINGLET FERMION DARK MATTER AND ELECTROWEAK BARYOGENESIS WITH RADIATIVE NEUTRINO MASS

2008 ◽  
Vol 23 (12) ◽  
pp. 1813-1819 ◽  
Author(s):  
K. S. BABU ◽  
ERNEST MA
Keyword(s):  
Dark Matter ◽  
Scalar Field ◽  
Standard Model ◽  
Neutrino Mass ◽  
The Other ◽  
Higgs Potential ◽  
Neutral Component ◽  
The Standard Model ◽  
Realistic Possibility ◽  
The Universe

The model of radiative neutrino mass with dark matter proposed by one of us is extended to include a real singlet scalar field. There are then two important new consequences. One is the realistic possibility of having the lightest neutral singlet fermion (instead of the lightest neutral component of the dark scalar doublet) as the dark matter of the universe. The other is a modification of the effective Higgs potential of the Standard Model, consistent with electroweak baryogenesis.

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