Local time-stepping in discontinuous Galerkin GRHMD evolution

Simulations involving a large range of length or time scales are inefficient due to the number of evaluations of evolution equations being set by the most stringent scales. Using a local time stepping scheme, where different degrees of freedom are evaluated at different times, can resolve this issue, but such schemes are generally low-order or fail to preserve conservation laws. We present a generic conservative, high-order local time stepping scheme and demonstrate applications to evolution of the GRMHD equations.