Article
Astronomy & Astrophysics
Zewei Xiong
Summary: Collective neutrino oscillations are important for determining the neutrino flavor content in core-collapse supernovae or compact binary merger remnants. This study examines the challenging many-body problem using a setup that allows for exact solutions for a large number of neutrinos. The results show that deviations from mean-field evolution can occur even in large systems, and the mechanism of many-body decoherence in flavor space is analyzed.
Article
Quantum Science & Technology
Kubra Yeter-Aydeniz, Shikha Bangar, George Siopsis, Raphael C. Pooser
Summary: In this study, we calculate the energy levels and transition probabilities of a neutrino system using the quantum Lanczos algorithm implemented on IBM Q quantum computer hardware. By simplifying the system Hamiltonian and using the Trotterization method, we achieve good agreement with exact results.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Particles & Fields
Gabriel M. Salla
Summary: In this paper, we study the interactions between neutrinos and dark matter by analyzing the potential generated by the galactic dark matter background. We compute this potential in a model-independent way and find that only ultra light scalar dark matter could be relevant to oscillation experiments under certain assumptions.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Soumya Bhattacharyya, Basudeb Dasgupta
Summary: This paper investigates the fast collective flavor oscillations of dense clouds of neutrinos and antineutrinos and their effect on flavor depolarization. The study provides an accurate analytical estimate for the lower resting point of the oscillations and explores the relaxation mechanisms that cause the system to settle down. The extent of depolarization, its dependence on momentum and net lepton asymmetry, as well as its generalization to three flavors are also discussed. The paper concludes by prescribing approximate analytical recipes for the depolarized distributions and fluxes, which can be applied in supernova/nucleosynthesis simulations and supernova neutrino phenomenology.
Article
Physics, Multidisciplinary
Marc Illa, Martin J. Savage
Summary: The time evolution of multi-neutrino entanglement and correlations in two-flavor collective neutrino oscillations is studied using simulations performed on Quantinuum's H1-1 20 qubit trapped-ion quantum computer. The study explores n-tangles, as well as two- and three-body correlations, to probe beyond mean-field descriptions. It is found that the n-tangle rescalings converge for large system sizes, indicating the presence of genuine multi-neutrino entanglement.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Yu-Chia Lin, Huaiyu Duan
Summary: We investigate collision-induced flavor instability in homogeneous, isotropic, dense neutrino gases with energy-dependent scattering. We find a simple expression for the growth rate of this instability, which depends on collision rates and the lepton number distribution of the neutrinos. The growth rate is independent of neutrino properties such as mass splitting and vacuum-mixing angle, as well as the matter density and neutrino density. Our results suggest that collision-induced flavor conversions can occur deep inside a core-collapse supernova, even when collective flavor oscillations are suppressed.
Article
Astronomy & Astrophysics
Taiki Morinaga
Summary: In this study, we demonstrate the equivalence between the existence of fast neutrino flavor instability and neutrino flavor lepton number (NFLN) crossings, indicating that NFLN angular distribution has both positive and negative signs. Despite its essential role in the flavor evolutions of dense neutrinos, the veracity of this proposition has been uncertain and controversial. This research clarifies that the occurrence of an NFLN crossing is both necessary and sufficient for fast instability.
Article
Astronomy & Astrophysics
Sajad Abbar
Summary: We have found that nonstandard neutrino self-interactions can result in complete flavor equipartition in a dense neutrino gas, such as in core-collapse supernovae. In this initial investigation of the multiangle scenario, we have demonstrated that this flavor equipartition can occur on very short scales, thus deep inside the newly formed proto-neutron star, potentially impacting the physics of core-collapse supernovae. Our findings suggest that future galactic core-collapse supernovae could effectively probe nonstandard neutrino self-interactions, even in cases where they are orders of magnitude smaller than the Standard Model terms.
Article
Astronomy & Astrophysics
Himanshu Swami, Kinjalk Lochan, Ketan M. Patel
Summary: We investigate decoherence effects in neutrino flavor oscillations in curved spacetime, focusing on the lensing in Schwarzschild geometry. The presence of a Schwarzschild object causes neutrino wave packets to travel more physical distance in space to lapse the same amount of proper time before they decoher. Decoherence in nonradial propagation is sensitive to neutrino masses, classical trajectories, and spatial widths of neutrino wave packets, with the observability of neutrino lensing significantly depending on leptonic mixing parameters.
Article
Mathematics, Applied
Jinjie Zhu
Summary: In this paper, a embedding phase reduction method is proposed to mitigate the impact of noise on SISR oscillators, and the effectiveness of this method is validated under periodic forcing. The simplicity and generality of this approach indicate its potential applications in practical experiments and biological systems.
APPLIED MATHEMATICS AND COMPUTATION
(2024)
Article
Astronomy & Astrophysics
Shashank Shalgar, Irene Tamborra
Summary: This study highlights that the fast flavor evolution of neutrinos in dense environments in three flavors is fundamentally different from the two flavor approximation, mainly due to the exponential growth of flavor mixing in the e-mu and e-tau sectors generated by the vacuum term in the Hamiltonian. Substantially larger flavor mixing is found in three flavors, suggesting that the two flavor approximation is not suitable for fast pairwise conversion even if the angular distributions of nonelectron neutrinos are initially identical.
Article
Physics, Particles & Fields
Kim Goldhagen, Michele Maltoni, Shayne E. Reichard, Thomas Schwetz
Summary: This study investigates the sensitivity of solar neutrino data to sterile neutrino mixing with masses greater than or similar to eV. The current data provides a robust limit on sterile neutrino mixing and excludes significant regions of the parameter space relevant to other experiments. The upcoming solar neutrino measurements will increase the sensitivity to sterile neutrino mixing by a factor of 4.5 compared to present limits. Additionally, a simplified analysis using four data points is introduced, which shows excellent agreement with a full analysis and can be applied to various new physics models.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Cyril Creque-Sarbinowski, Jeffrey Hyde, Marc Kamionkowski
Summary: The study introduces a fully analytic form for astrophysical neutrino spectra that accurately captures resonance features in observable spectra, applicable to any number of neutrinos and self-coupling matrices.
Article
Astronomy & Astrophysics
G. Barenboim, P. Martinez-Mirave, C. A. Ternes, M. Tortola
Summary: In this paper, new bounds on CPT violation in the solar neutrino sector are set based on the analysis of solar experiments and KamLAND. The sensitivity of the next-generation experiments DUNE and Hyper-Kamiokande is discussed, as well as the potential improvement in CPT violation bounds through joint analysis. The distinguishability between CPT-violating neutrino oscillations and neutrino nonstandard interactions in the solar sector is also addressed.
Article
Astronomy & Astrophysics
Vladislav Barinov, Dmitry Gorbunov
Summary: The recent BEST experiment confirmed the gallium anomaly, which is a lack of electron neutrinos in the calibrations of SAGE and GALLEX. This result is consistent with the oscillation of electron neutrinos into sterile neutrinos. The BEST experiment provides the strongest evidence for sterile neutrinos among previous anomalous results in the neutrino sector. Combining the results of gallium experiments with searches for sterile neutrinos in reactor antineutrino experiments, a part of the BEST-favored 2 sigma region is consistent with all of them. Additionally, the regions advertised by the anomalous results of the NEUTRINO-4 experiment overlap with those of the BEST experiment.