GPU-accelerated ray tracing for post-processing cosmological simulations with THOR

Abstract

I present THOR, a GPU-accelerated code for post-processing cosmological simulations, built on a shared ray-tracing core. Written once against a common interface, analyses run identically on grid, moving-mesh, and particle data across simulation codes. Applications include Monte Carlo radiative transfer for resonant lines, absorption spectra along sightlines, and identification of spatial structures such as field lines, clumps, and filaments. As one recent application, I show the diversity of predicted Lyman-alpha spectra across the AGORA CosmoRun simulations. THOR is publicly available at thor-rt.org.