EPS-HEP2021 conference

Construction and verification of analytical approximation of nonequilibrium neutrino distribution function in core-collapse supernova

Not scheduled

20m

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Poster Astroparticle and Gravitational Waves T01: Astroparticle and Gravitational Waves

Speaker

Eugenia Koptyaeva (P. G. Demidov Yaroslavl State University)

Description

The local nonequilibrium neutrino distribution function in a core-collapse
supernova is considered and two variants of its analytical approximation are
suggested. The proposed analytical approximations are verified using the results
of a one-dimensional simulation of neutrino propagation, performed self-
consistently with hydrodynamics in Prometheus-Vertex code. It was shown that
the approximation, based on a nominal Fermi-Dirac distribution of neutrino
spectrum, agrees with results of Prometheus-Vertex simulation only in the inner
parts of the supernova. Whereas the approximation based on alpha-fit of
neutrino energy distribution, also known as Gamma-distribution, is more general
and has no restrictions for application in any part of the supernova. The obtained
results could be applied for estimation of various neutrino effects in supernova
conditions without their direct inclusion in the explosion simulation. The work is
supported by the Russian Science Foundation (Grant No. 18-72-10070).

Presentation materials

Dobrynina_Koptyaeva_Ognev_EPS-HEP-21.pdf