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Multimessenger Constraints on Radiatively Decaying Axions from GW170817
Melissa Diamond, Damiano F. G. Fiorillo, Gustavo Marques-Tavares +2
The metastable hypermassive neutron star produced in the coalescence of two neutron stars can copiously produce axions that radiatively decay into ~MeV photons. T…
Snowmass 2021 topical group report: Neutrinos from Natural Sources
Yusuke Koshio, Gabriel D. Orebi Gann, Erin O'Sullivan +1
This is the final report from the Snowmass 2021 Neutrino Frontier Topical Group on Neutrinos from Natural Sources. It covers a broad range of neutrino sources, from low-energy neut…
Neutrino Fast Flavor Pendulum. Part 2: Collisional Damping
Ian Padilla-Gay, Irene Tamborra, Georg G. Raffelt
In compact astrophysical objects, the neutrino density can be so high that neutrino-neutrino refraction can lead to fast flavor conversion of the kind $ν_e \barν_e \leftrightarrow…
Symmetry breaking induced by pairwise conversion of neutrinos in compact sources
Shashank Shalgar, Irene Tamborra
A surprising consequence of non-linear flavor evolution is the spontaneous breaking of the initial symmetries of the neutrino gas propagating in a dense astrophysical environment.…
The three flavor revolution in fast pairwise neutrino conversion
Shashank Shalgar, Irene Tamborra
The modeling of fast flavor evolution of neutrinos in dense environments has been traditionally carried out by relying on a two flavor approximation for simplicity. In addition, va…
Astrophysical constraints on non-standard coherent neutrino-nucleus scattering
Anna M. Suliga, Irene Tamborra
The exciting possibility of detecting supernova, solar, and atmospheric neutrinos with coherent neutrino-nucleus scattering detectors is within reach, opening up new avenues to pro…
Invisible Neutrino Decay Resolves IceCube's Track and Cascade Tension
Peter B. Denton, Irene Tamborra
The IceCube Neutrino Observatory detects high energy astrophysical neutrinos in two event topologies: tracks and cascades. Since the flavor composition of each event topology diffe…
Fast Pairwise Conversion of Supernova Neutrinos: A Dispersion-Relation Approach
Ignacio Izaguirre, Georg Raffelt, Irene Tamborra
Collective pair conversion by forward scattering, where or , may be generic for supernova neutrino transport. Depending on the l…
Supernova Neutrinos: Theory
Irene Tamborra
Neutrinos play a key role in core-collapse supernova explosions. Carrying information from deep inside the stellar core, neutrinos are direct probes of the supernova mechanism. Int…
(Down-to-)Earth matter effect in supernova neutrinos
Enrico Borriello, Sovan Chakraborty, Alessandro Mirizzi +2
Neutrino oscillations in the Earth matter may introduce peculiar modulations in the supernova (SN) neutrino spectra. The detection of this effect has been proposed as diagnostic to…
Light Sterile Neutrinos: A White Paper
K. N. Abazajian, M. A. Acero, S. K. Agarwalla +184
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and the latest astrophysical data.
Supernova neutrino halo and the suppression of self-induced flavor conversion
Srdjan Sarikas, Irene Tamborra, Georg Raffelt +2
Neutrinos streaming from a supernova (SN) core occasionally scatter in the envelope, producing a small "neutrino halo" with a much broader angle distribution than the primary flux…
Cosmology seeking friendship with sterile neutrinos
Jan Hamann, Steen Hannestad, Georg G. Raffelt +2
Precision cosmology and big-bang nucleosynthesis mildly favor extra radiation in the universe beyond photons and ordinary neutrinos, lending support to the existence of low-mass st…
Synchronization vs. decoherence of neutrino oscillations at intermediate densities
Georg G. Raffelt, Irene Tamborra
We study collective oscillations of a two-flavor neutrino system with arbitrary but fixed density. In the vacuum limit, modes with different energies quickly de-phase (kinematical…
Neutrino mass hierarchy and three-flavor spectral splits of supernova neutrinos
Basudeb Dasgupta, Alessandro Mirizzi, Irene Tamborra +1
It was recently realized that three-flavor effects could peculiarly modify the development of spectral splits induced by collective oscillations, for supernova neutrinos emitted du…
Triggering collective oscillations by three-flavor effects
Basudeb Dasgupta, Georg G. Raffelt, Irene Tamborra
Collective flavor transformations in supernovae, caused by neutrino-neutrino interactions, are essentially a two-flavor phenomenon driven by the atmospheric mass difference and the…
Supernova neutrinos and antineutrinos: ternary luminosity diagram and spectral split patterns
Gianluigi Fogli, Eligio Lisi, Antonio Marrone +1
In core-collapse supernovae, the nu_e and anti-nu_e species may experience collective flavor swaps to non-electron species nu_x, within energy intervals limited by relatively sharp…
Collective flavour transitions of supernova neutrinos
Irene Tamborra
When the neutrino density is very high, as in core-collapse supernovae, neutrino-neutrino interactions are not negligible and can appreciably affect the evolution of flavour. The p…
Supernova neutrino three-flavor evolution with dominant collective effects
Gianluigi Fogli, Eligio Lisi, Antonio Marrone +1
Neutrino and antineutrino fluxes from a core-collapse galactic supernova are studied, within a representative three-flavor scenario with inverted mass hierarchy and tiny 1-3 mixing…
Low-energy spectral features of supernova (anti)neutrinos in inverted hierarchy
G. L. Fogli, E. Lisi, A. Marrone +2
In the dense supernova core, self-interactions may align the flavor polarization vectors of neutrinos and antineutrinos, and induce collective flavor transformations. Different ali…