GRTresna: An open-source code to solve the initial data constraints in numerical relativity
General Relativity and Quantum Cosmology
2026-05-28 v2 Instrumentation and Methods for Astrophysics
Abstract
GRTresna is a multigrid solver designed to solve the constraint equations for the initial data required in numerical relativity simulations. In particular, it is focussed on scenarios with fundamental fields around black holes and inhomogeneous cosmological spacetimes. The code is based on the formalism in Aurrekoetxea, Clough \& Lim arXiv:2207.03125 and can be found at https://github.com/GRTLCollaboration/GRTresna
Keywords
Cite
@article{arxiv.2501.13046,
title = {GRTresna: An open-source code to solve the initial data constraints in numerical relativity},
author = {Josu C. Aurrekoetxea and Sam E. Brady and Llibert Aresté-Saló and Jamie Bamber and Liina Chung-Jukko and Katy Clough and Eloy de Jong and Matthew Elley and Pau Figueras and Thomas Helfer and Eugene A. Lim and Miren Radia and Areef Waeming and Zipeng Wang},
journal= {arXiv preprint arXiv:2501.13046},
year = {2026}
}
Comments
Matches published version in the Journal of Open Source Software (JOSS). Code available at https://github.com/GRTLCollaboration/GRTresna