Collisions and collective flavor conversion: Integrating out the fast dynamics

Fiorillo, Damiano F. G.; Padilla-Gay, Ian; Raffelt, Georg G.

doi:10.1103/PhysRevD.109.063021

Title: Collisions and collective flavor conversion: Integrating out the fast dynamics

Journal Article · 17 March 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.063021 · OSTI ID:2325196

; Padilla-Gay, Ian;

In dense astrophysical environments, notably core-collapse supernovae and neutron star mergers, neutrino-neutrino forward scattering can spawn flavor conversion on very short scales. Scattering with the background medium can impact collective flavor conversion in various ways, either damping oscillations or possibly setting off novel collisional flavor instabilities (CFIs). A key feature in this process is the slowness of collisions compared to the much faster dynamics of neutrino-neutrino refraction. Assuming spatial homogeneity, we leverage this hierarchy of scales to simplify the description accounting only for the slow dynamics driven by collisions. We illustrate our new approach both in the case of CFIs and in the case of fast instabilities damped by collisions. In both cases, our strategy provides new equations, the , that simplify the description of flavor conversion and allow us to qualitatively understand the final state of the system after the instability, either collisional or fast, has saturated. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2325196

Alternate ID(s):: OSTI ID: 2405016

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 6 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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