Post-Newtonian collapse calculations

The dynamical collapse of a rotating body (with a mass less than the critical mass) from white dwarf densities down toward neutron star densities is examined with a view to resolving some of the effects of rotation on the evolution. In the approach used here, the post-Newtonian equations for continuity and momentum (Chandrasekhar, 1964) for a perfect fluid are modeled with the smoothed particle hydrodynamics of Gingold and Monagham (1982). The version of the code used conserves both linear and angular momentum exactly. Collapse calculations are carried out using a 1000-particle code. The results obtained are briefly discussed, and improvements to the code are suggested.