The Effect of the Collisional Flavor Instability on Core-Collapse Supernova Models

2025/07/01 by Tianshu Wang, Hiroki Nagakura, Wang, Tianshu +5 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE) #Neutrino Physics Research #Particle physics theoretical and experimental studies #Solar and Stellar Astrophysics (astro-ph.SR)

paper · pdf · doi:10.48550/arxiv.2507.01100

openalex publication_date 2025/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We explore the effects of the neutrino collisional flavor instability (CFI) based on 1D and 2D core-collapse supernova (CCSN) simulations done using the sophisticated radiation-hydrodynamic code Fornax. We compare the growth rates of homogeneous CFI (hCFI) modes calculated by numerically solving the multi-group dispersion relation to those calculated using the monochromatic approximation. We find that the widely-used monochromatic approximation leads to incorrect growth rates when applied in multi-group scenarios. As opposed to the ∼10⁵ s^-1 values given by the monochromatic approximation, the actual growth rates of non-resonance multi-group hCFI are at most ∼200 s^-1 in all our models and they are too slow to affect CCSN outcomes. We adopt a BGK flavor conversion scheme in the simulations to include the effects of resonance-like hCFI. We find that the CCSN dynamics and neutrino emission properties are only weakly influenced, and the intrinsic stochasticity due to convection and neutrino-driven turbulence can naturally lead to comparable effects. Hence, our analysis of the non-resonance and resonance-like hCFI into CCSN simulations suggests that the effects of neutrino flavor conversion triggered by hCFI modes are in general small.

Citations

• Comparative Testing of Subgrid Models for Fast Neutrino Flavor Conversions in Core-collapse Supernova Simulations
• Dispersion relation of the neutrino plasma: Unifying fast, slow, and collisional instabilities
• Predicting the outcome of collisional neutrino flavor conversion
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• Three-dimensional core-collapse supernova models with phenomenological treatment of neutrino flavor conversions
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• Basic characteristics of neutrino flavor conversions in the post-shock regions of core-collapse supernova
• Black-Hole Formation Accompanied by the Supernova Explosion of a 40-M_\odot Progenitor Star
• Neutrinos from dense environments : Flavor mechanisms, theoretical approaches, observations, and new directions
• CORE-COLLAPSE SUPERNOVA EQUATIONS OF STATE BASED ON NEUTRON STAR OBSERVATIONS

Cited by

• Neutrino-Mass-Driven Instabilities as the Earliest Flavor Conversion in Supernovae
• Comparative Testing of Subgrid Models for Fast Neutrino Flavor Conversions in Core-collapse Supernova Simulations

Related

• The Effect of the Fast-Flavor Instability on Core-Collapse Supernova Models: II. Quasi-Equipartition and the Impact of Various Angular Reconstruction Methods
• The Effect of the Fast-Flavor Instability on Core-Collapse Supernova Models
• Testing common approximations of neutrino fast flavor conversion
• Predicting the outcome of collisional neutrino flavor conversion
• Basic characteristics of neutrino flavor conversions in the post-shock regions of core-collapse supernova