Phase transitions and gravitational collapse

Details Phase transitions and gravitational collapse Phase transitions and gravitational collapse

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.........8g&link_type=abstract

Ph.D. Thesis Lawrence Livermore National Lab., Livermore, CA.

Mathematics

Equations Of State, Gravitational Collapse, Hydrodynamics, Mathematical Models, Phase Transformations, Gluons, Quantum Chromodynamics, Quarks, Relativity, Shock Waves, Supernovae, Viscosity

Scientific paper

Results are presented for numerical calculations of gravitational collapses and explosions. Two effects are studied. The first involves aspects of the numerical models used in almost all current gravitational collapse calculations. The second involves phase transitions in the equation of state of dense matter. A (1 + 1) dimensional general relativistic hydrodynamics code was constructed to investigate both effects. A modification of standard artificial viscosity methods was developed. This extended both the tensor artificial viscosity formulation and the artificial heat conduction formulation to the general relativistic regime. This method shows better results for collapse calculations than the standard scalar artificial viscosity. Numerical collapse calculations were also examined with respect to the number of zones used in the model. These calculations suggest that the number of zones used in current supernova calculations may be insufficient, and that the more sophisticated artificial viscosity methods used may be useful in future core collapse investigations. The second effect studied by this thesis is the impact of phase transitions in dense matter on the results of core collapse in Type 2 supernovae. Two different phase transitions were investigated. The QCD phase transition embodies the prediction of quantum chromodynamics that at high density the constituents of baryonic matter will be free quarks and gluons. The effects on the shock wave formed by core collapse and bounce is studied for various phase transitions. We find that some of the phase transitions modeled significantly increase the shock strength.

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