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GRTresna: An open-source code to solve the initial data constraints in numerical relativity

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arxiv 2501.13046 v2 pith:EGMCTCQS submitted 2025-01-22 gr-qc astro-ph.IM

Josu C. Aurrekoetxea , Sam E. Brady , Llibert Aresté-Saló , Jamie Bamber , Liina Chung-Jukko , Katy Clough , Eloy de Jong , Matthew Elley
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Pau Figueras Thomas Helfer Eugene A. Lim Miren Radia Areef Waeming Zipeng Wang
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keywords grtresnacodedatainitialnumericalrelativitysolvearound
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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

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Cited by 4 Pith papers

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  3. Inflaton Dynamics in Higher-Derivative Scalar-Tensor Theories of Gravity

    gr-qc 2025-05 conditional novelty 6.0 of 10

    In the weakly coupled regime of a four-derivative scalar-tensor theory, large inflationary inhomogeneities decay just as in general relativity, and only finely tuned initial data can escape the effective field theory'...

  4. Preheating and oscillon formation in Einstein-scalar-Gauss-Bonnet gravity

    gr-qc 2026-07 unverdicted novelty 5.0 of 10

    Simulations in Einstein-scalar-Gauss-Bonnet gravity show oscillons form with similar properties to standard cases but trigger EFT breakdown for large couplings via high local curvatures.

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