Statistics – Computation
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..428d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 428-432.
Statistics
Computation
11
Computational Astrophysics, Neutrinos, Neutron Stars, Nuclear Astrophysics, Opacity, Stellar Evolution, Monte Carlo Method, Supernovae, Transport Properties
Scientific paper
Recently a modification to flux-limited neutrino diffusion schemes was suggested by introduction of a correction term, which acts like an additional nonphysical opacity. By this 'artificial opacity' the evolution of the neutrino flow in the outer layers of compact stellar objects like newly formed neutron stars is determined. It allows to reduce or even eliminate the error in the momentum balance associated with solutions of the standard flux-limited diffusion schemes. We demonstrate the principle applicability of the modified approach. The corresponding technical changes can easily be incorporated in any standard flux-limiting method and lead to results in better agreement with neutrino transport by direct solution of the Boltzmann equation, when an appropriate flux-limiter is used. This is of immediate importance for reliable investigations of the neutrino-heated delayed explosion mechanism of type-II supernovae.
Dgani Ruth
Janka H.-Th.
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