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Dark Population Transfer Mechanism for Sterile Neutrino Dark Matter.
Phys Rev Lett
November 2024
Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, USA.
We present a mechanism for producing a cosmologically significant relic density of one or more sterile neutrinos. This scheme invokes two steps: First, a population of "heavy" sterile neutrinos is created by scattering-induced decoherence of active neutrinos. Second, this population is transferred, via sterile neutrino self-interaction-mediated scatterings and decays, to one or more lighter mass (∼10 keV to ∼1 GeV) sterile neutrinos that are far more weakly (or not at all) mixed with active species and could constitute dark matter.
View Article and Find Full Text PDFAxion Emission from Strange Matter in Core-Collapse SNe.
Phys Rev Lett
September 2024
LAPTh, Université Savoie Mont-Blanc et CNRS, 74941 Annecy, France.
The duration of the neutrino burst from the supernova event SN 1987A is known to be sensitive to exotic sources of cooling, such as axions radiated from the dense and hot hadronic matter thought to constitute the inner core of the supernova. We perform the first quantitative study of the role of hadronic matter beyond the first generation--in particular strange matter. We do so by consistently including the full baryon and meson octets, and computing axion emissivity induced from baryon-meson to baryon-axion scatterings as well as from baryon decays.
View Article and Find Full Text PDFInhomogeneous Kinetic Equation for Mixed Neutrinos: Tracing the Missing Energy.
Phys Rev Lett
July 2024
Universität Hamburg, II. Institut für Theoretische Physik, 22761 Hamburg, Germany.
Flavor-dependent neutrino transport is described by a well-known kinetic equation for occupation-number matrices in flavor space. However, in the context of fast flavor conversion, we identify an unforeseen predicament: the pivotal self-induced exponential growth of small inhomogeneities strongly violates conservation of neutrino-neutrino refractive energy. We prove that it is traded with the huge reservoir of neutrino kinetic energy through gradients of neutrino flavor coherence (the off-diagonal piece of the flavor density matrix) and derive the missing gradient terms.
View Article and Find Full Text PDFFirst Measurement of η Meson Production in Neutrino Interactions on Argon with MicroBooNE.
Phys Rev Lett
April 2024
Brookhaven National Laboratory (BNL), Upton, New York 11973, USA.
We present a measurement of η production from neutrino interactions on argon with the MicroBooNE detector. The modeling of resonant neutrino interactions on argon is a critical aspect of the neutrino oscillation physics program being carried out by the DUNE and Short Baseline Neutrino programs. η production in neutrino interactions provides a powerful new probe of resonant interactions, complementary to pion channels, and is particularly suited to the study of higher-order resonances beyond the Δ(1232).
View Article and Find Full Text PDFResonances of Supernova Neutrinos in Twisting Magnetic Fields.
Phys Rev Lett
March 2024
Instituto de Física Gleb Wataghin - UNICAMP, 13083-859, Campinas, São Paulo, Brazil.
We investigate the effect of resonant spin conversion of the neutrinos induced by the geometrical phase in a twisting magnetic field. We find that the geometrical phase originating from the rotation of the transverse magnetic field along the neutrino trajectory can trigger a resonant spin conversion of Dirac neutrinos inside the supernova, even if there were no such transitions in the fixed-direction field case. We have shown that, even though resonant spin conversion is too weak to affect solar neutrinos, it could have a remarkable consequence on supernova neutronization bursts where very intense magnetic fields are quite likely.
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