Stellar core collapse: Numerical model and infall epoch

Journal Article · Thu Aug 01 00:00:00 EDT 1985 · Astrophys. J., Suppl. Ser.; (United States)

DOI:https://doi.org/10.1086/191056· OSTI ID:5266951

Bruenn, S W

A numerical model based on hydrodynamics coupled to radiation transport of all neutrino types is developed for calculating stellar core collapse. General relativistic hydrodynamic equations for spherically symmetric systems including neutrino flow are obtained and presented in a form paralleling the adiabatic equations of May and White (1967). A multigroup, flux-limited diffusion scheme, used to evolve ..nu../sub e/'s, nu-bar/sub e/'s, and ..nu../sub ..mu../ and ..nu../sub tau/ pairs independently, is derived from the neutrino Boltzmann equation. Expressions for the zeroth and first Legendre moments of all important neutrino interactions are derived from the standard model of electroweak interactions. Numerical values are obtained from these expressions (by numerical integration when necessary) during core-collapse calculations. An implicit numerical scheme for directly solving the neutrino equations, including the neutrino-electron scattering and neutrino thermal production terms, is presented. This scheme includes a consistent treatment of neutrino-matter decoupling in the neutrino transparent regimes. At the present time, the equation of state of Lamb et al. (1978, 1981) up to nuclear density, and that of Friedman and Pandharipande (1981) above nucleon density, are incorporated in the numerical model.

• Research Organization: Florida Atlantic University, Boca Raton
• OSTI ID: 5266951
• Journal Information: Astrophys. J., Suppl. Ser.; (United States), Vol. 58:4
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GRAVITATIONAL COLLAPSE
NUMERICAL ANALYSIS
STARS
BARYONS
COSMIC NEUTRINOS
DENSITY
DIAGRAMS
ELECTRON CAPTURE
ENTROPY
HYDRODYNAMICS
LEPTONS
LUMINOSITY
RADIANT HEAT TRANSFER
STAR EVOLUTION
THEORETICAL DATA
WEAK INTERACTIONS
BASIC INTERACTIONS
CAPTURE
COSMIC RADIATION
DATA
ELEMENTARY PARTICLES
ENERGY TRANSFER
FERMIONS
FLUID MECHANICS
HADRONS
HEAT TRANSFER
INFORMATION
INTERACTIONS
IONIZING RADIATIONS
MASSLESS PARTICLES
MATHEMATICS
MECHANICS
NEUTRINOS
NUMERICAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
THERMODYNAMIC PROPERTIES
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
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