Article
Astronomy & Astrophysics
Andre de Gouvea, Ivan Martinez-Soler, Yuber F. Perez-Gonzalez, Manibrata Sen
Summary: The relic neutrinos from old supernova explosions are among the most ancient neutrino fluxes within experimental reach. By studying the diffuse supernova neutrino background, we can investigate if neutrino masses were different in the past. Our calculations indicate that the v(e) energy spectrum could be significantly different from standard expectations if neutrinos were effectively massless at early times as long as the neutrino mass ordering is normal. However, the (v) over bar (e) flux is not expected to be significantly impacted. Therefore, measuring both the neutrino and antineutrino components of the diffuse supernova neutrino background can test the possibility of recent neutrino mass generation.
Article
Astronomy & Astrophysics
A. Capolupo, A. Quaranta
Summary: We demonstrate that studying non-relativistic neutrino capture on tritium can differentiate between different neutrino models, confirm quantum field theory condensation effects, and test the hypothesis of flavor vacuum energy contributing to the dark matter of the universe. The capture rate depends on the chosen neutrino model and reflects the presence of flavor vacuum condensate. Experiments like PTOLEMY designed to detect the cosmic neutrino background could indicate the existence of dark matter component induced by neutrino mixing.
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
L. J. Flores, Newton Nath, Eduardo Peinado
Summary: This study focuses on probing generalized neutrino interactions (GNIs) in coherent-elastic neutrino-nucleus scattering experiments, using data from COHERENT-CsI and -LAr. The analysis helps constrain exotic couplings and reactor data strongly constrained electron flavor GNIs.
Article
Physics, Multidisciplinary
Basudeb Dasgupta
Summary: Researchers have found that neutrinos may undergo collective and unstable flavor changes in supernovae, neutron stars, and the early Universe due to neutrino-neutrino forward scattering. This finding is important for studying stellar dynamics, nucleosynthesis, and neutrino phenomenology.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Eleonora Di Valentino, Stefano Gariazzo, Carlo Giunti, Olga Mena, Supriya Pan, Weiqiang Yang
Summary: Minimal dark energy models may solve tensions between cosmological observations and sterile neutrinos, as well as the Hubble tension.
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
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
Zewei Xiong, Yong-Zhong Qian
Summary: The paper presents a method to find stationary solutions for fast flavor oscillations of a homogeneous dense neutrino gas, which can account for numerical results of explicit evolution calculations and provide average survival probabilities with the simplest assumption of adiabatic evolution. The paper also discusses the improvement of these solutions and their use as estimates of the effects of fast oscillations in astrophysical environments.
Article
Astronomy & Astrophysics
Masamichi Zaizen, Hiroki Nagakura
Summary: In this paper, we study fast neutrino-flavor conversion (FFC) in dense neutrino gases in astrophysical sites such as core-collapse supernovae (CCSNe) and binary neutron star mergers (BNSMs). We find that the asymptotic states of FFC can be characterized by the conservation of lepton number for each flavor of neutrinos and the disappearance of angular crossings in the spatial or time-averaged distributions. These properties of FFCs provide an approximate scheme to determine the survival probability of neutrinos in asymptotic states without solving quantum kinetic equations. The total amount of flavor conversion can also vary with species-dependent neutrino distributions.
Article
Astronomy & Astrophysics
Xu-Run Huang, Shuai Zha, Lie-Wen Chen
Summary: A core-collapse supernova is a unique setting for studying neutrino-matter interactions. Research shows that nonstandard neutrino interactions can significantly enhance the luminosity of the preshock burst, impacting astrophysics, neutrino physics, and physics beyond the standard model.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
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.
Article
Astronomy & Astrophysics
Jose Alonso Carpio, Ali Kheirandish, Kohta Murase
Summary: Thermal MeV neutrino emissions from core-collapse supernovae provide a unique opportunity to explore physics beyond the Standard Model in the neutrino sector. The next generation of neutrino experiments, such as DUNE and Hyper-Kamiokande, can detect a large number of neutrinos in the event of a Galactic supernova. Interaction between supernova neutrinos and local dark matter may result in neutrino echoes with significant time delays, allowing us to probe parameter space not explored by dark matter direct detection experiments.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Nuclear
Gabriele Inghirami, Paula Hillmann, Boris Tomasik, Marcus Bleicher
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2020)
Article
Physics, Nuclear
Paula Hillmann, Jan Steinheimer, Tom Reichert, Vincent Gaebel, Marcus Bleicher, Sukanya Sombun, Christoph Herold, Ayut Limphirat
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2020)
Article
Physics, Nuclear
V Steinberg, J. Steinheimer, H. Elfner, M. Bleicher
Summary: Hadronic interactions are crucial for heavy-ion reactions, and the HADES collaboration measured particle production in collisions of pions with carbon and tungsten nuclei, studying the properties and decay channels of baryonic resonances.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Article
Physics, Nuclear
Michael F. Wondrak, Matthias Kaminski, Marcus Bleicher
Summary: The study illustrates that the shear viscosity of QCD matter in ultrarelativistic heavy-ion collisions initially decreases to below 60% during the initial heating phase, followed by an overshoot to 110%. This finding is crucial for extracting transport coefficients from anisotropic flow measurements at RHIC and LHC.
Article
Physics, Nuclear
Vincent Gaebel, Michel Bonne, Tom Reichert, Ajdin Burnic, Paula Hillmann, Marcus Bleicher
Summary: The study analyzed the deuteron coalescence parameter B-2 in proton+proton and nucleus+nucleus collisions, finding that B-2 decreases sharply with increasing energy at low energies and saturates at a constant level at higher energies, which is attributed to volume effect and strong radial flow.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Physics, Nuclear
Tom Reichert, Paula Hillmann, Marcus Bleicher
Summary: The Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport approach is used to calculate Delta(1232) yields in Ca+Ca, Ni+Ni and Au+Au collisions between 1 AGeV and 2 AGeV. Two different methods are compared and validated to extract the yields of Delta(1232) resonances in low energy nuclear collisions, showing compatibility between them. The extracted temperatures using the A/nucleon ratio are consistent with predicted mass shift of the Delta resonance and freeze-out parameters estimated from complementary studies.
Article
Physics, Particles & Fields
Patricio Gaete, Piero Nicolini, Euro Spallucci
Summary: This paper presents a method to address the limitations of charged black holes in (2 + 1)-dimensional anti-de Sitter space-time, by extending the parameter space of the BTZ geometry and properly identifying integration constants. The result is a well-defined internal energy, consistent with the Area Law, corresponding to a van der Waals gas.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
A. Kittiratpattana, M. F. Wondrak, M. Hamzic, M. Bleicher, A. Limphirat, C. Herold
Summary: The study investigates (anti)deuteron formation rates in heavy-ion collisions using a wave-function based coalescence model. The model explains the nucleon-antinucleon annihilations at lower beam energies by emitting nucleons from the entire fireball volume and antinucleons from a spherical shell near the surface. Comparison with experimental data and results from the UrQMD transport model show a qualitative trend in the geometric radii as a function of beam energy, with stronger annihilation observed at the central region of the fireball at lower energies.
Article
Astronomy & Astrophysics
Tom Reichert, Gabriele Inghirami, Marcus Bleicher
Summary: The HADES experiment at GSI has provided data on the flow coefficients for protons in low energy Au+Au reactions, allowing for the estimation of the shear viscosity over entropy density ratio. The analysis compared UrQMD transport simulations to experimental data, resulting in an estimate of eta/s around 0.65 +/- 0.15 at such low energies.
Article
Astronomy & Astrophysics
Patricio Gaete, Piero Nicolini
Summary: In this paper, we present the repercussions of Padmanabhan's propagator in electrodynamics, implementing T-duality effects in a U(1) gauge theory. Through formulating a nonlocal action and using a path integral approach, we derive the profile of static potentials between electric charges and find that the Coulomb potential is regularized by a length scale proportional to the parameter (alpha' )(1/2), with the fields vanishing at the origin. We also discuss experimental testbeds to verify these results and observe that T-duality generates an effect of dimensional fractalization resembling phenomena in fractional electromagnetism.
Review
Astronomy & Astrophysics
Piero Nicolini
Summary: This paper provides an overview of the current issues in quantum gravity research. It introduces the concept of duality in path integrals, which is consistent with T-duality in string theory. The duality reveals a universal feature of quantum geometry, namely the existence of a zero point length L-0. Recent developments exploring the effects of L-0 in strong electrodynamics and black holes are also discussed.
GENERAL RELATIVITY AND GRAVITATION
(2022)
Article
Astronomy & Astrophysics
Patricio Gaete, Kimet Jusufi, Piero Nicolini
Summary: In this paper, a family of regular black hole solutions in the presence of charge and angular momentum is presented. The thermodynamics of these solutions is discussed, as well as the life cycle of black holes during the balding and spin down phases. The use of Padmanabhan's propagator to calculate static potentials encodes string T-duality effects, suggesting that these regular solutions could provide insights into string theory phenomenology.
Article
Physics, Nuclear
A. G. Knospe, C. Markert, K. Werner, J. Steinheimer, M. Bleicher
Summary: The study utilized the EPOS3 model and UrQMD model to investigate hadronic phase in p-Pb collisions, focusing on short-lived hadronic resonances and modifications to their yields and pT spectra. Findings revealed similarities between high-multiplicity p-Pb collisions and midperipheral Pb-Pb collisions at LHC energies, with indications of a short-lived hadronic phase in p-Pb collisions impacting resonance yields and pT spectra through scattering processes. Additionally, resonance production evolution was studied in relation to system size, shedding light on scattering effects in p-Pb collisions.
Proceedings Paper
Physics, Multidisciplinary
Paula Hillmann, Jan Steinheimer, Tom Reichert, Vincent Gaebel, Marcus Bleicher, Sukanya Sombun, Christoph Herold, Ayut Limphirat
FAIR NEXT GENERATION SCIENTISTS (FAIRNESS2019)
(2020)
Article
Physics, Nuclear
Apiwit Kittiratpattana, Michael F. Wondrak, Medina Hamzic, Marcus Bleicher, Christoph Herold, Ayut Limphirat
EUROPEAN PHYSICAL JOURNAL A
(2020)
