Article
Astronomy & Astrophysics
Chinami Kato, Hiroki Nagakura, Masamichi Zaizen
Summary: In this study, we investigate the effects of neutrino emission and absorption on fast neutrino flavor conversions and collisional flavor instabilities through numerical simulations. The results show that in the early phase, fast neutrino flavor conversions are dominated by fast neutrino flavor conversions, while neutrino emission and absorption significantly impact flavor conversions. In the later phase, the system approaches new asymptotic states characterized by neutrino emission and absorption and collisional flavor instabilities, with energy-dependent structures emerging. Multienergy effects sustain fast neutrino flavor conversions, and the time evolution of flavor conversion becomes energy dependent.
Article
Physics, Particles & Fields
Takaaki Nomura, Hiroshi Okada
Summary: The proposed model utilizes A(4) symmetry to restrict the structure of the neutrino mass matrix in the lepton sector, making predictions that satisfy lepton flavor violations and neutrino oscillation data. Additionally, the model discusses muon anomalous magnetic moment and briefly mentions dark matter candidates.
Article
Astronomy & Astrophysics
Guenter Sigl
Summary: We investigate the spatial and temporal instabilities in collective neutrino oscillations induced by neutrino self-interactions, focusing on inhomogeneous systems with density profiles. Our simulations show that refractive effects from the medium and neutral current nonforward scattering off the background medium can strongly influence fast collective flavor transformations.
Article
Astronomy & Astrophysics
Zewei Xiong, Meng-Ru Wu, Sajad Abbar, Soumya Bhattacharyya, Manu George, Chun-Yu Lin
Summary: In this study, we investigated the asymptotic survival probability distributions of fast flavor conversions of neutrinos using numerical simulations with different initial angular distributions. We proposed improved methods to ensure the continuity of the angular distributions after the conversions. The research results can inspire the exploration and design for more effective methods applicable to realistic hydrodynamic simulations.
Article
Physics, Nuclear
Abdel Perez-Lorenzana
Summary: The exchange mu - tau symmetry in the effective Majorana neutrino mass matrix predicts maximal mixing for atmospheric neutrino oscillations, as well as a nonzero value for theta(13). Breaking of the symmetry results in solar neutrino mixing and scale, as well as the correct atmospheric mixing. A proposed mass matrix for normal hierarchy remains stable under renormalization effects and can also account for CP violation within the expected range.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2021)
Article
Physics, Nuclear
Carlos Alvarado, Janelly Bautista, Alexander J. Stuart
Summary: By assuming three massive nondegenerate Majorana neutrinos, neutrino mixing can be described with an unbroken discrete Klein subgroup of a larger spontaneously broken flavor symmetry group. Motivated by forthcoming measurements of leptonic CP violation, this framework is revisited using group presentation rules. A method is developed to reproduce previous results and may hint at a group theoretical origin of CP violation in the Klein symmetry elements, which is due to the explicit appearance of a phase. However, for the analyzed cases, this phase can be removed. Nonetheless, further study is warranted for this new method.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2023)
Article
Physics, Multidisciplinary
A. Garcia Soto, P. Zhelnin, I Safa, C. A. Arguelles
Summary: This letter addresses the impact of high-energy muon and electron neutrinos generating a tau neutrino flux as they pass through Earth, and the sensitivity of Earth-skimming neutrino experiments to cosmogenic neutrinos.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Labh Singh, Tapender, Monal Kashav, Surender Verma
Summary: In this paper, a phenomenological ansatz for the magic neutrino mass matrix (M & nu;) is proposed by extending the magic symmetry, which leads to a reduction in the number of free parameters and increases the predictability of the model. The correlations between the neutrino mixing parameters, effective Majorana mass mee, and CP invariants (JCP, I1 , I2) are found to be strong for the trimaximal mixing scheme (TM2). The findings have important implications for the neutrino mass hierarchy and CP violation measurements.
Article
Physics, Nuclear
V. V. Vien, H. N. Long
Summary: The proposed multiscalar and nonrenormalizable B - L extension of the standard model with S-4 symmetry explains the recently observed neutrino oscillation data and predicts effective neutrino masses in good agreement with experimental data. The model successfully reproduces recent experiments of neutrino mixing angles and Dirac CP violating phase.
Article
Physics, Multidisciplinary
Bipin Singh Koranga, Vivek Kumar Nautiyal
Summary: The study discusses the range of mixing parameters in a four-neutrino scenario and the implications for neutrino mass square difference and mixing. It determines the possible values of the effective majorana neutrino mass and provides upper bounds on the mass for different mass orderings in the four-neutrino scheme.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Physics, Nuclear
V. V. Vien
Summary: This article proposes a low-scale Standard Model extension with specific symmetries that can explain observed neutrino oscillation results and provides predictions for neutrino mass ordering, lepton mixing angles, and phases, which are consistent with experimental results.
Article
Astronomy & Astrophysics
Hirokazu Sasaki, Tomoya Takiwaki
Summary: The equilibration of neutrino-antineutrino oscillations in dense matter is sensitive to the values of the baryon density and the electron fraction, with oscillations being suppressed in neutron- (proton)-rich matter with large baryon density. However, flavor equilibration can still occur when the electron fraction is close to 0.5 even in high baryon density. The necessary condition for equilibration suggests that a magnetic field larger than 10^14 G near the protoneutron star could allow for flavor equilibration.
Article
Astronomy & Astrophysics
E. Grohs, A. B. Balantekin
Summary: The generation mechanism of neutrino masses remains a puzzle in particle physics. This work focuses on how Dirac neutrinos can populate thermal states via an anomalous magnetic moment operator. It considers a class of models where all neutrinos have a magnetic moment independent of flavor or chirality. The interactions between neutrinos and background plasma particles are calculated to derive the relic inactive neutrino energy as a function of plasma temperature. The contribution of extra Dirac states to the matter energy density at late times is investigated by examining neutrino free streaming.
Article
Physics, Multidisciplinary
J. D. Garcia-Aguilar, J. C. Gomez-Izquierdo
Summary: This study investigates the lepton sector within a flavored non-renormalizable model, where flavor symmetry controls the masses and mixings. The hierarchical mass matrices in this model are consistent with experimental data. The model favors the normal hierarchy and predicts values for other important parameters.
REVISTA MEXICANA DE FISICA
(2022)
Article
Physics, Particles & Fields
Salvador Centelles Chulia, Ricardo Cepedello, Omar Medina
Summary: This article introduces a simple extension of the scotogenic model, promoting the scotogenic symmetry to a flavor non-Abelian symmetry. The predicted results are closely related to the lepton sector, and a strong correlation between the solar mixing angle and the Majorana phases is proposed.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)