In a single process, the merger of binary neutron star systems combines extreme gravity, the
copious emission of gravitational waves, complex microphysics and electromagnetic …

The proposal that core collapse supernovae are neutrino driven is still the subject of active
investigation more than 50 years after the seminal paper by Colgate and White. The modern …

Context. Computational astrophysics nowadays routinely combines grid-adaptive
capabilities with modern shock-capturing, high resolution spatio-temporal integration …

We study scalar fields in a black hole background and show that, when the scalar is suitably
coupled to curvature, rapid rotation can induce a tachyonic instability. This instability, which …

The Portable, Extensible Toolkit for Scientific Computation (PETSc), is a suite of data
structures and routines for the scalable (parallel) solution of scientific applications modeled …

In this survey we consider the development and mathematical analysis of numerical
methods for kinetic partial differential equations. Kinetic equations represent a way of …

Fully general relativistic models of astrophysical sources are in high demand, not only since
the discovery of gravitational waves emitted from merging stellar mass black holes (Abbott et …

Black hole (BH) accretion flows and jets are dynamic hot relativistic magnetized plasma
flows whose radiative opacity can significantly affect flow structure and behaviour. We …

High-quality ordinary differential equation (ODE) solver libraries have a long history, going
back to the 1970s. Over the past several years we have implemented, on top of the PETSc …

We present the asymptotic transitions from microscopic to macroscopic physics, their
computational challenges and the asymptotic-preserving (AP) strategies to compute …