Metraipolis › archive › dc_5b93d514b02c

PANGU I: A Parthenon-Based Framework for Fixed-Spacetime GRMHD — arXiv:2609.27515

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.27515
License (as archived): CC0-1.0
Archived: 2026-10-08T13:20:47.585Z
SHA-256 of the archived text: cb3fbf5d37917b1a4b37a0319725f048ec96a23263a7f32936b768b9752d2f02
Stable URL of this page: https://metraipolis.com/documento/dc_5b93d514b02c

How to cite

PANGU I: A Parthenon-Based Framework for Fixed-Spacetime GRMHD — arXiv:2609.27515 — arXiv (en), https://arxiv.org/abs/2609.27515 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_5b93d514b02c (Metraipolis archive dc_5b93d514b02c, sha256 cb3fbf5d37917b1a4b37a0319725f048ec96a23263a7f32936b768b9752d2f02)

BibTeX

@misc{dc5b93d514b02c,
  title = {PANGU I: A Parthenon-Based Framework for Fixed-Spacetime GRMHD — arXiv:2609.27515},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.27515},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_5b93d514b02c; sha256 cb3fbf5d37917b1a4b37a0319725f048ec96a23263a7f32936b768b9752d2f02},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.27515. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Existing general-relativistic magnetohydrodynamics (GRMHD) codes offer complementary capabilities, but these capabilities remain distributed across different frameworks. To unify them, we introduce PANGU--Parthenon-Based Astrophysics for Numerical Relativity and GRMHD in a Unified Framework--a modular computational framework that integrates a shared solver across physical regimes, flexible spacetime geometry, and extensible computational infrastructure within a single architecture. In the first paper of this series, we present and validate the fixed-spacetime GRMHD component of PANGU. The shared solver combines finite-volume Godunov methods with constrained transport on uniform and block-structured, statically refined meshes, and covers hydrodynamics and magnetohydrodynamics in Newtonian, special-relativistic, and general-relativistic regimes. PANGU provides a flexible geometry interface supporting coordinate selection and either on-the-fly or precomputed evaluation of prescribed stationary spacetimes, demonstrated here in Kerr spacetime with Cartesian Kerr-Schild and modified Kerr-Schild coordinates; additional components can be incorporated without restructuring the core solver. Verification covers all three regimes on uniform and statically refined meshes: smooth Newtonian and special-relativistic problems approach second order against their analytic solutions, with deliberately matched double-precision trajectories agreeing with AthenaK to roundoff; in fixed-spacetime GRMHD, the stationary analytic solutions are preserved to second order, and the turbulent accretion reproduces the same flow and flux scales as BHAC. Together, these results establish the fixed-spacetime matter-sector foundation for the broader PANGU framework. Numerical-relativity and coupled dynamical-spacetime GRMHD capabilities will be presented in subsequent work.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-24 in gr-qc).
Categorie arXiv: High Energy Astrophysical Phenomena (astro-ph.HE) ; General Relativity and Quantum Cosmology (gr-qc).
Pagina del lavoro: https://arxiv.org/abs/2609.27515 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-08T13:11:03.895Z dalla pagina https://arxiv.org/catchup/gr-qc/2026-09-24?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).