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Smoothed Particle Hydrodynamics coupled with Radiation Transfer

We have been constructed a brand-new radiation hydrodynamics solver based upon Smoothed Particle Hydrodynamics (SPH), which works on parallel computer system. The code is designed to investigate the formation and evolution of the first generation objects at $z \gtrsim 10$, where the radiative feedback from various sources play important roles. The code can compute the fraction of chemical species e, H$^+$, H, H$^-$, H$_2$, and H$_2^+$ by fully implicit time integration. It also can deal with multiple sources of ionizing radiation, as well as the radiation at Lyman-Werner band. We compare the results for a few test calculations with the results of one dimensional simulations, in which we find good agreements with each other. We also evaluate the speedup by parallelization, that is found to be almost ideal, as far as the number of sources is comparable to the number of processors.