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The flavor evolution of neutrinos emitted by a supernova (SN) core is strongly affected by the refractive effects associated with the neutrino-neutrino interactions in the deepest stellar regions. Till now, all numerical studies have…

High Energy Physics - Phenomenology · Physics 2015-06-16 Alessandro Mirizzi

It has been recently discovered that removing the axial symmetry in the "multi-angle effects" associated with the neutrino-neutrino interactions for supernova (SN) neutrinos, a new multi-azimuthal-angle (MAA) instability would trigger…

High Energy Physics - Phenomenology · Physics 2015-06-17 Sovan Chakraborty , Alessandro Mirizzi

It has been recently pointed out that removing the axial symmetry in the "multi-angle effects" associated with the neutrino-neutrino interactions for supernova (SN) neutrinos, a new multi-azimuthal-angle (MAA) instability would arise. In…

High Energy Physics - Phenomenology · Physics 2014-05-14 Sovan Chakraborty , Alessandro Mirizzi , Ninetta Saviano , David de Sousa Seixas

Neutrino-neutrino refraction causes self-induced flavor conversion in dense neutrino fluxes. For the first time, we include the azimuth angle of neutrino propagation as an explicit variable and find a new generic multi-azimuth-angle (MAA)…

High Energy Physics - Phenomenology · Physics 2014-11-18 Georg Raffelt , Srdjan Sarikas , David de Sousa Seixas

We study three-flavor collective neutrino transformations in the dense-neutrino region above the neutrino sphere of a supernova core. We find that two-flavor conversions driven by the atmospheric mass difference and the 13-mixing angle…

Astrophysics · Physics 2008-12-18 Andreu Esteban-Pretel , Sergio Pastor , Ricard Tomas , Georg G. Raffelt , Gunter Sigl

We investigate the collective neutrino oscillations under the three flavor multi-angle approximation in a spherically symmetric simulation of failed supernovae. A failed supernova emits high neutrino fluxes in a short time, while intense…

High Energy Astrophysical Phenomena · Physics 2018-12-19 Masamichi Zaizen , Takashi Yoshida , Kohsuke Sumiyoshi , Hideyuki Umeda

We demonstrate the non-negligible effect of transition magnetic moments on three-flavor collective oscillations of Majorana neutrinos in the core of type-II supernovae, within the single-angle approximation. We argue that data from a…

High Energy Astrophysical Phenomena · Physics 2015-06-12 Andre de Gouvea , Shashank Shalgar

We revisit our previous results on the matter suppression of self-induced neutrino flavor conversions during a supernova (SN) accretion phase, performing a linearized stability analysis of the neutrino equations of motion, in the presence…

High Energy Physics - Phenomenology · Physics 2015-06-04 Ninetta Saviano , Sovan Chakraborty , Tobias Fischer , Alessandro Mirizzi

In this paper, we explore the effects of neutrino flavor oscillations on supernova nucleosynthesis and on the neutrino signals. Our study is based on detailed information about the neutrino spectra and their time evolution from a…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Meng-Ru Wu , Yong-Zhong Qian , Gabriel Martinez-Pinedo , Tobias Fischer , Lutz Huther

Collective flavor transformations in supernovae, caused by neutrino-neutrino interactions, are essentially a two-flavor phenomenon driven by the atmospheric mass difference and the small mixing angle theta_13. In the two-flavor…

High Energy Physics - Phenomenology · Physics 2010-04-29 Basudeb Dasgupta , Georg G. Raffelt , Irene Tamborra

Neutrinos and antineutrinos emitted from a core collapse supernova interact among themselves, giving rise to collective flavor conversion effects that are significant near the neutrinosphere. We develop a formalism to analyze these…

High Energy Physics - Phenomenology · Physics 2010-01-21 Basudeb Dasgupta , Amol Dighe

We examine coherent active-active channel neutrino flavor evolution in environments where neutrino-neutrino forward scattering can engender large-scale collective flavor transformation. We point out a key quantity, the "total effective…

Astrophysics · Physics 2008-11-26 Huaiyu Duan , George M. Fuller , Yong-Zhong Qian

We study two-flavor neutrino oscillations in homogeneous neutrino gases in which neutrinos and anti-neutrinos are in nearly pure weak interaction states initially. We find that the monopole and dipole oscillation modes can trigger flavor…

High Energy Physics - Phenomenology · Physics 2014-01-10 Huaiyu Duan

We study two-flavor collective neutrino oscillations in the dense-neutrino region above the neutrino sphere in a supernova (SN). The angular dependence of the neutrino-neutrino interaction potential causes "multi-angle" effects that can…

High Energy Physics - Phenomenology · Physics 2008-11-26 Andreu Esteban-Pretel , Sergio Pastor , Ricard Tomas , Georg Raffelt , Gunter Sigl

Neutrinos in a core-collapse supernova can undergo fast flavor conversions with a possible impact on the explosion mechanism and nucleosynthesis. We perform the first non-linear simulations of fast conversions in the presence of three…

High Energy Physics - Phenomenology · Physics 2021-01-04 Francesco Capozzi , Madhurima Chakraborty , Sovan Chakraborty , Manibrata Sen

We study the effects of collective neutrino oscillations on $\nu p$ process nucleosynthesis in proton-rich neutrino-driven winds by including both the multi-angle $3\times3$ flavor mixing and the nucleosynthesis network calculation. The…

High Energy Astrophysical Phenomena · Physics 2017-09-13 H. Sasaki , T. Kajino , T. Takiwaki , T. Hayakawa , A. B. Balantekin , Y. Pehlivan

Fast neutrino flavor conversions (FFCs) and collisional flavor instabilities (CFIs) potentially affect the dynamics of core-collapse supernovae (CCSNe) and binary neutron star mergers (BNSMs). Under the assumption of homogeneous neutrinos,…

High Energy Astrophysical Phenomena · Physics 2023-07-19 Chinami Kato , Hiroki Nagakura , Masamichi Zaizen

We investigate the indications of flavor oscillations that come from the anomalous flavor composition of the atmospheric neutrino flux observed in some underground experiments. We study the information coming from the neutrino-induced…

High Energy Physics - Phenomenology · Physics 2009-10-07 G. L. Fogli , E. Lisi , D. Montanino , G. Scioscia

The recent observations of atmospheric nu events from the Super-Kamiokande experiment are compatible with three-flavor neutrino oscillations, occurring dominantly in the nu_mu<--->nu_tau channel and subdominantly in the nu_mu<--->nu_e…

High Energy Physics - Phenomenology · Physics 2007-05-23 G. L. Fogli , E. Lisi , A. Marrone , G. Scioscia

Neutrino flavor evolution in core-collapse supernovae, neutron-star mergers, or the early universe is dominated by neutrino-neutrino refraction, often spawning "self-induced flavor conversion", i.e., shuffling of flavor among momentum…

High Energy Physics - Phenomenology · Physics 2016-06-22 Sovan Chakraborty , Rasmus Sloth Hansen , Ignacio Izaguirre , Georg Raffelt
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