GRDzhadzha is an open-source code for relativistic simulations of matter fields on curved spacetimes that admit an analytic description (e.g. stationary black holes). It is based on the publicly available 3+1D numerical relativity code GRChombo. Such a description is valid where the density of the matter is small compared to the curvature scale of the spacetime, which is the case for many physical scenarios - for example, dark matter environments. The approach offers significant savings on memory and speed compared to running full numerical relativity simulations, since the metric variables and their derivatives are calculated analytically, and therefore are not evolved or stored on the grid. This brief paper introduces the code and gives details of some applications for which it has already been used.
Cite
@article{arxiv.2308.08299,
title = {GRDzhadzha: A code for evolving relativistic matter on analytic metric backgrounds},
author = {Josu C. Aurrekoetxea and Jamie Bamber and Sam E. Brady and Katy Clough and Thomas Helfer and James Marsden and Dina Traykova and Zipeng Wang},
journal= {arXiv preprint arXiv:2308.08299},
year = {2023}
}
Comments
Submitted for review in the Journal of Open Source Software; Comments welcome; The code can be found at https://github.com/GRChombo/GRDzhadzha.git