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检索条件"丛书名=Springer Proceedings in Physics"

共 4830 条记录，以下是1-10 订阅

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An Approach to Dirac Neutrino Mass with Singlet-Doublet Dark Matter and ΔNeff

An Approach to Dirac Neutrino Mass with Singlet-Doublet Dark...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Sahoo, Sujit Kumar Indian Inst Technol Hyderabad Dept Phys Hyderabad 502285 Telangana India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We propose a scotogenic scenario where the singlet-doublet dark matter plays an important role in generating Dirac neutrino mass. It is possible to address muon anomalous magnetic moment with charged doublet in the loop. Due to the Dirac nature of neutrino, the additional right-handed neutrino (RHN) can contribute to the additional relativistic degrees of freedom, Delta Neff, in the Universe. We show that the tiny Dirac neutrino mass correlates the parameter space of muon (g - 2), Delta Neff and plays a non-trivial role in deciding the relic density of dark matter. We analyse the thermal dark matter and its detection prospects. We also explored thermal and non-thermal origin of Delta Neff and the parameter space, explored in this work, is verifiable at future CMB experiments like CMB-S4 and SPT-3G.

关键词： Dark Matter (DM) Neutrino mass ΔNeff

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Neutrino Mass Model Based on Δ(27) Symmetry with Additional Higgs Doublets

Neutrino Mass Model Based on Δ(27) Symmetry with Additional...

引用

2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Wilina, Ph. Singh, Ngangkham Nimai Manipur Univ Dept Phys Imphal 795003 Manipur India Res Inst Sci & Technol Imphal 795003 India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We develop a neutrino mass model based on Delta(27) discrete symmetry by using three Higgs doublets, three right-handed neutrinos, and two Delta(27) triplets to explain neutrino oscillation parameters consistent with the Planck cosmological bound on the sum of the three absolute neutrino mass eigenvalues,. Sigma|m(i) | < 0.12 eV. The detailed numerical analysis is carried out by applying input model parameters and the predicted neutrino oscillation parameters are in agreement with the global neutrino oscillation data for both normal (NH) and inverted (IH) hierarchical model. We also calculate the effective neutrino masses for neutrinoless double beta decay (m(ee)), tritium beta decay (m beta), and Jarlskog invariant (J(CP)) for CP violation as m(ee) <= 30.6 meV,.m beta <= 30.5 meV, and J(CP) <= 0.0217 for NH, and m(ee) <= 51.7 meV, m beta <= 51.4 meV, and J(CP) <= 0.0222 for IH.

关键词： Jarlskog invariant neutrinoless double beta decay tritium beta decay Δ(27) symmetry

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TeV Scale Leptogenesis in Extended Scotogenic Model

TeV Scale Leptogenesis in Extended Scotogenic Model

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Singh, Labh Mahanta, Devabrat Verma, Surender Cent Univ Himachal Pradesh Dept Phys & Astron Sci Dharamshala India Abhayapuri Coll Dept Phys Bongaigaon Assam India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We explore the potential for low-scale leptogenesis in the singlet-triplet scotogenic model where dark matter participates in neutrino mass generation radiatively. Our investigation focuses on two possible scenarios. The first scenario introduces two heavy right-handed (RH) fermion fields, F and Sigma, with moderate hierarchy. In this case, the out-of-equilibrium decay of these particles results in the emergence of a lepton asymmetry. Our analysis reveals that the scale of leptogenesis in this scenario resembles that of standard thermal leptogenesis with. M-F,(Sigma) similar to 10(9) GeV. In the second scenario, we propose a framework to lower the scale of leptogenesis. In particular, we have considered two singlet fermions (F-1, F-2) and one triplet fermion (Sigma), which results in non-zero lightest active neutrino mass, i.e. m(1) not equal 0. With the mass hierarchy. M-F1 < M-Sigma << M-F2, this scenario yields a lower bound on heavy RH fermion, significantly reducing the scale of leptogenesis up to the TeV range. Also, real component of the neutral part of inert scalar (eta) is the dark matter candidate in the model.

关键词： Dark-matter Leptogenesis Phenomenology W Mass

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Sensitivities at Long-Baseline Experiments in the Light of Invisible Neutrino Decay

Sensitivities at Long-Baseline Experiments in the Light of I...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Dey, Zannatun Firdowzy Dutta, Debajyoti Assam Don Bosco Univ Tapesia Campus Sonapur 782402 Assam India Bhattadev Univ Bajali 781325 Assam India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

We study the impact of invisible neutrino decay in the measurements of octant and mass hierarchy sensitivities at long-baseline neutrino experiments. DUNE (Deep Underground Neutrino Experiment) and T2HKK (Tokai-to-Hyper-Kamiokande-to-Korea) are two upcoming long baseline experiments that can contribute a lot to precision measurements in the neutrino sector. Assuming v(3) to be unstable, we show the effect of the invisible neutrino decay in the measurements of the sensitivities at the far detector of these experiments. We have also performed a combined analysis of the two experiments. The octant sensitivity increases, while mass hierarchy sensitivity changes very slightly in the presence of invisible neutrino decay. The value of the decay parameter. tau(3)/m(3) considered in this work is 2.2 x 10(-11) s/eV.

关键词： DUNE Invisible neutrino decay T2HKK

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A Real Scalar Singlet Pseudo-FIMP in Presence of a Real Scalar WIMP

A Real Scalar Singlet Pseudo-FIMP in Presence of a Real Scal...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Pradhan, Dipankar Bhattacharya, Subhaditya Lahiri, Jayita Indian Inst Technol Guwahati Dept Phys Gauhati 781039 Assam India Univ Hamburg Inst Theoret Phys D-22761 Hamburg Germany

ISBN: (纸本)9789819774432;9789819774418;9789819774401

In the multi-component dark matter (DM) framework, DM-DM conversion has an important role in DM phenomenology. Depending on its conversion rate and its visible connection, we might be able to reach different kinds of multipartite thermal DM scenarios. Here, we show the dynamics of DM.(DM1), which has a feeble visible connection with the visible sector, in the presence of any thermal DM.(DM2). We propose to classify this new kind of DM as pseudo-FIMP (pFIMP) which has unique characteristics impacting the relic density, direct, and collider search implications. We studied it in a model-independent manner by solving coupled Boltzmann Equations (cBEQ) and also for a toy model with two-component real scalar DM.

关键词： Models for dark matter Particle nature of dark matter Specific BSM phenomenology

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Study of Traversable Wormhole in the Dark Matter Halo

Study of Traversable Wormhole in the Dark Matter Halo

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Nath, Partha Pratim Sarma, Debojit Cotton Univ Gauhati India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

In this work, we have carried out the study of a traversable wormhole in the dark matter halo. We have formulated the exact solution of the spherically symmetric traversable wormhole with isotropic pressure conditions by using the Jaffe dark matter density profile. The Jaffe profile produces a suitable shape function that meets all the requirements for presenting the wormhole geometries. We have investigated all the necessary energy conditions viz., null energy condition(NEC), weak energy condition(WEC), strong energy condition(SEC), and dominant energy conditions(DEC) for the considered wormhole. All the suitable stability conditions are analyzed and explained by related plots.

关键词： Dark matter halo Energy conditions TOV equation Traversable wormhole

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Mass Varying Neutrino and Quintessence: A Comparative Study of Scaling Solution

Mass Varying Neutrino and Quintessence: A Comparative Study ...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Bundeliya, Hemanshi Pathak, S. D. Lovely Profess Univ Dept Phys Phagwara 144411 Punjab India

We investigate the comparative study of mass varying neutrino and canonical scalar field (quintessence) as a source of dark energy in the spatially flat (k = 0) universe. We obtained the scaling solution of dominating... 详细信息

ISBN: (纸本)9789819774432;9789819774418;9789819774401

关键词： Dark energy

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Inelastic Self-interacting Dark Matter in Non-standard Cosmology

Inelastic Self-interacting Dark Matter in Non-standard Cosmo...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Dutta, Manoranjan North Lakhimpur Univ Dept Phys Lakhimpur 787031 Assam India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

Inconsistencies between the predictions based on the Lambda CDM model and astrophysical observations at dwarf and galaxy scales motivate alternatives to WIMPs. A compelling alternative is the self-interacting dark matter (SIDM), which not only addresses the anomalies on small scales but also aligns seamlessly with the large-scale Lambda CDM predictions. Nevertheless, the thermal relic of SIDM tends to be under-abundant within the standard cosmological framework, which considers dark matter decoupling from the cosmic soup in a radiation-dominated epoch. To tackle this challenge, our approach involves introducing a non-standard expansion history of the universe by incorporating a non-radiation-like component into the cosmic soup. In this modified scenario, SIDM decouples at an early epoch compared to the standard model, resulting in an enhanced relic density that matches observed values. We consider our SIDM candidate to be a pseudo-Dirac fermion to nullify its diagonal vector interaction, thereby circumventing direct search constraints. Through this, we identify a parameter space that remains consistent with astrophysical observations and relic density criteria.

关键词： dark matter non-standard cosmology self-interacting dark matter

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Study of One Zero Texture and One Vanishing Subtrace in Neutrino Mass Matrix

Study of One Zero Texture and One Vanishing Subtrace in Neut...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Dey, Sangeeta Patgiri, Mahadev Cotton Univ Gauhati India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

In this work, we investigate the existence of one zero texture and one vanishing subtrace in the Majorana neutrino mass matrix. There are a total of thirty-six possible textures of neutrino mass matrix with the constrained conditions of one zero texture and one vanishing subtrace. Here we explore the phenomenological implications of only two classes of textures, i.e., Class A and Class B. We analyze the viability of all the textures using the ratio of the solar and atmospheric mass-squared differences (R-nu). Out of 12 textures of both the classes, only one texture (A(1)) from class A and three textures (B-1, B-4 and B-5) from class B are found to be viable under the current neutrino oscillation data at 3 sigma confidence level. Finally, we study the ranges of the Majorana Phases (alpha and beta) for the allowed range of the Dirac CP phase, delta for all the viable textures.

关键词： Neutrino mass matrix One vanishing subtrace One zero texture

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Neutrino Masses and Mixing in an Inverse Seesaw Model with S4 Modular Flavor Symmetry

Neutrino Masses and Mixing in an Inverse Seesaw Model with S...

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2024 International Conference on Future Prospects in Neutrino and Astroparticle physics-ICFPNAP

作者： Kalita, Raktima Cotton Univ Dept Phys Gauhati 781001 Assam India

ISBN: (纸本)9789819774432;9789819774418;9789819774401

In our work, we have used modular invariance approach to construct a neutrino mass model in the framework of the inverse seesaw mechanism with modular S-4 flavor symmetry which requires less number of flavon fields. The phenomenological study of the neutrino mass matrix is carried out and correlation plots are drawn using the current 3 sigma ranges of neutrino oscillation data to test the compatibility of the model with experiments. Again the use of inverse seesaw mechanism allows the right-handed neutrinos to have masses in the TeV scale which may be feasible at the current large hadron collider experiment.

关键词： Inverse seesaw mechanism Modular invariance Yukawa couplings

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