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Neutrinos propagating in a dense neutrino gas, such as those expected in core-collapse supernovae (CCSNe) and neutron star mergers (NSMs), can experience fast flavor conversions on relatively short scales. This can happen if the neutrino…

High Energy Astrophysical Phenomena · Physics 2023-05-17 Sajad Abbar

In dense neutrino environments like core-collapse supernovae (CCSNe) and neutron star mergers (NSMs), neutrinos can undergo fast flavor conversions (FFC) when their angular distribution of neutrino electron lepton number ($\nu$ELN) crosses…

High Energy Astrophysical Phenomena · Physics 2024-01-23 Sajad Abbar , Akira Harada , Hiroki Nagakura

Neutrino flavor instabilities appear to be omnipresent in dense astrophysical environments, thus presenting a challenge to large-scale simulations of core-collapse supernovae and neutron star mergers (NSMs). Subgrid models offer a path…

High Energy Astrophysical Phenomena · Physics 2025-05-27 Sherwood Richers , Julien Froustey , Somdutta Ghosh , Francois Foucart , Javier Gomez

Fast-pairwise neutrino oscillations potentially affect many aspects of core-collapse supernova (CCSN): the explosion mechanism, neutrino signals, and nucleosynthesis in the ejecta. This particular mode of collective neutrino oscillations…

High Energy Astrophysical Phenomena · Physics 2021-09-15 Hiroki Nagakura , Lucas Johns

Fast-pairwise collective neutrino oscillation represents a key uncertainty in the theory of core-collapse supernova (CCSN). Despite the potentially significant impact on CCSN dynamics, it is usually neglected in numerical models of CCSN…

High Energy Astrophysical Phenomena · Physics 2021-11-03 Hiroki Nagakura , Lucas Johns , Adam Burrows , George M. Fuller

Neutrino-neutrino forward scatterings potentially induce collective neutrino oscillation in dense neutrino gases in astrophysical sites such as core-collapse supernovae (CCSN) and binary neutron star mergers (BNSM). In this paper, we…

High Energy Astrophysical Phenomena · Physics 2023-05-24 Masamichi Zaizen , Hiroki Nagakura

Neutrinos can undergo fast flavor conversions (FFCs) within extremely dense astrophysical environments such as core-collapse supernovae (CCSNe) and neutron star mergers (NSMs). In this study, we explore FFCs in a \emph{multi-energy}…

High Energy Astrophysical Phenomena · Physics 2024-02-01 Sajad Abbar , Meng-Ru Wu , Zewei Xiong

Fast flavor conversions (FFCs) of neutrinos, which can occur in core-collapse supernovae (CCSNe), are multiangle effects. They depend on the angular distribution of the neutrino's electron lepton number (ELN). In this work, we present a…

High Energy Astrophysical Phenomena · Physics 2025-04-22 Zewei Xiong , Meng-Ru Wu , Manu George , Chun-Yu Lin , Noshad Khosravi Largani , Tobias Fischer , Gabriel Martínez-Pinedo

We explore the impact of small-scale flavor conversions of neutrinos, the so-called fast flavor conversions (FFCs), on the dynamical evolution and neutrino emission of core-collapse supernovae (CCSNe). In order to do that, we implement FFCs…

High Energy Astrophysical Phenomena · Physics 2023-05-31 Jakob Ehring , Sajad Abbar , Hans-Thomas Janka , Georg Raffelt , Irene Tamborra

We assert that non-linear features of fast neutrino-flavor conversion (FFC) can be qualitatively different between core-collapse supernovae (CCSNe) and binary neutron star mergers (BNSMs). This argument arises from recent global FFC…

High Energy Astrophysical Phenomena · Physics 2025-05-22 Masamichi Zaizen , Hiroki Nagakura

We make a strong case that the fast neutrino-flavor conversion, one of the collective flavor oscillation modes, commonly occurs in core-collapse supernovae (CCSNe). It is confirmed in the numerical data obtained in realistic simulations of…

High Energy Astrophysical Phenomena · Physics 2020-03-04 Taiki Morinaga , Hiroki Nagakura , Chinami Kato , Shoichi Yamada

There is mounting evidence that neutrinos undergo fast flavor conversion (FFC) in core-collapse supernova (CCSN). In this letter, we investigate the roles of stellar rotation on the occurrence of FFC by carrying out axisymmetric CCSN…

High Energy Astrophysical Phenomena · Physics 2022-01-26 Akira Harada , Hiroki Nagakura

We present a systematic study of fast neutrino-flavor conversion (FFC) with both small-scale and large-scale numerical simulations in spherical symmetry. We find that FFCs can, in general, reach a quasi-steady state, and these features in…

High Energy Astrophysical Phenomena · Physics 2023-04-12 Hiroki Nagakura , Masamichi Zaizen

One of the active debates in core-collapse supernova (CCSN) theory is how significantly neutrino flavor conversions induced by neutrino-neutrino self-interactions change the conventional picture of CCSN dynamics. Recent studies have…

High Energy Astrophysical Phenomena · Physics 2023-11-16 Hiroki Nagakura , Masamichi Zaizen

In very dense environments, neutrinos can undergo fast flavor conversions on scales as short as a few centimeters provided that the angular distribution of the neutrino lepton number crosses zero. This work presents the first attempt to…

High Energy Astrophysical Phenomena · Physics 2021-05-05 Francesco Capozzi , Sajad Abbar , Robert Bollig , H. -Thomas Janka

The dense neutrino medium in a core-collapse supernova or a neutron-star merger event can experience fast flavor conversions on time/distance scales that are much smaller than those of vacuum oscillations. It is believed that fast neutrino…

High Energy Astrophysical Phenomena · Physics 2020-01-14 Sajad Abbar , Huaiyu Duan , Kohsuke Sumiyoshi , Tomoya Takiwaki , Maria Cristina Volpe

A dense neutrino gas, such as the one anticipated in the supernova environment, can experience fast neutrino flavor conversions on scales much shorter than those expected in vacuum probably provided that the angular distributions of $\nu_e$…

High Energy Astrophysical Phenomena · Physics 2020-02-26 Sajad Abbar , Huaiyu Duan , Kohsuke Sumiyoshi , Tomoya Takiwaki , Maria Cristina Volpe

The flavor conversion of a neutrino usually occurs at densities $\lesssim G_F^{-1} \omega$, whether in the ordinary matter or the neutrino medium, and on time/distance scales of order $\omega^{-1}$, where $G_F$ is the Fermi weak coupling…

High Energy Physics - Phenomenology · Physics 2018-08-22 Sajad Abbar , Huaiyu Duan

Neutrinos experience collective flavor conversion in extreme astrophysical environments such as core-collapse supernovae (CCSNe). One manifestation of collective conversion is slow flavor conversion (SFC), which has recently attracted…

High Energy Astrophysical Phenomena · Physics 2025-09-03 Ian Padilla-Gay , Heng-Hao Chen , Sajad Abbar , Meng-Ru Wu , Zewei Xiong

One of the greatest uncertainties in any modeling of inner engine of core-collapse supernova (CCSN) is neutrino flavor conversions driven by neutrino self-interactions. We carry out large-scale numerical simulations of multi-energy,…

High Energy Astrophysical Phenomena · Physics 2023-06-07 Hiroki Nagakura
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