Séminaire / Seminar GReCO |
| « Angular moments for neutrino transport: the quantum case » |
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Julien Froustey |
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Neutrino transport is a key component of numerical simulations of dense astrophysical environments, such as core-collapse supernovae or neutron star mergers. Because of the massive computational cost associated with describing multi-dimensional, multi-momentum neutrino distributions, methods that rely solely on angular moments (i.e., weighted angular averages of these distributions) have long been developed. Such methods require a closure, which enables the formulation of a closed system of equations by evolving only a small set of angular moments. However, large-scale simulations have yet to incorporate the quantum phenomenon of neutrino flavor oscillations, which are particularly complex in dense environments. A promising approach is to generalize moment methods to include flavor mixing, necessitating the development of quantum closures.
In this talk, I will introduce the classical closure problem and present recent efforts in the development and application of genuine quantum closures. In particular, I'll introduce the first example of an ab initio fully quantum closure, and how it can describe some neutrino flavor instabilities in neutron star mergers. |
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lundi 6 janvier 2025 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |