General Relativistic Implicit Monte Carlo Radiation-hydrodynamics

Abstract We report on a new capability added to our general relativistic radiation-magnetohydrodynamics code, Cosmos++ : an implicit Monte Carlo (IMC) treatment for radiation transport. The method is based Fleck-type discretization of the radiation-hydrodynamics equations, but generalized both Newtonian and regimes. A multiple reference frame approach used geodesically transport photon packets (and solve hydrodynamics equations) in coordinate frame, while radiation–matter interactions are handled either fluid or electron frames then communicated via Lorentz boosts orthonormal tetrad bases attached fluid. describe constructing estimators moments using path-weighting that generalizes arbitrary systems flat curved spacetime. Absorption, emission, scattering, Comptonization among matter considered this report. discuss formulations numerical methods, validate models against suite coupled test problems spacetimes.