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Celephais: efficient spectral initial data code for precessing compact binaries — arXiv:2608.07653

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.07653
License (as archived): CC0-1.0
Archived: 2026-10-19T09:30:19.329Z
SHA-256 of the archived text: 3c3e24b447557c587b7849e4358152e1642d2aead18ef5ce238b14d16236fab9
Stable URL of this page: https://metraipolis.com/documento/dc_bbbd2fce6f2f

How to cite

Celephais: efficient spectral initial data code for precessing compact binaries — arXiv:2608.07653 — arXiv (en), https://arxiv.org/abs/2608.07653 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_bbbd2fce6f2f (Metraipolis archive dc_bbbd2fce6f2f, sha256 3c3e24b447557c587b7849e4358152e1642d2aead18ef5ce238b14d16236fab9)

BibTeX

@misc{dcbbbd2fce6f2f,
  title = {Celephais: efficient spectral initial data code for precessing compact binaries — arXiv:2608.07653},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.07653},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_bbbd2fce6f2f; sha256 3c3e24b447557c587b7849e4358152e1642d2aead18ef5ce238b14d16236fab9},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.07653. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Large numerical-relativity surveys require compact-binary initial data that are both spectrally accurate and inexpensive to construct, including for systems with unequal masses and misaligned spins. We present \celephais, a compact-object initial-data code built on the \texttt{Kadath} spectral library, that constructs binary-neutron-star and black-hole--neutron-star initial data without imposing equatorial symmetry. The method exploits the sparse structure of the globally coupled multi-domain Jacobian and the approximate parity separation of fields. The assembled matrix is factored with \texttt{MUMPS} and reused as a refreshed right preconditioner in a Jacobian-free Newton--Krylov iteration, thereby avoiding dense storage. An adaptive $hp$--refinement scheme then concentrates resolution where the spectral tails are not yet resolved. For a mass-ratio-$20$ black-hole--neutron-star benchmark, the adaptive schemes recover the uniform-grid constraint accuracy with about three times fewer unknowns. We also extend the post-Newtonian force-balance estimate to arbitrary spin orientations and use it to initialise eccentricity reduction. Validation comprises binding-energy comparisons with post-Newtonian sequences, a precessing binary-neutron-star eccentricity-reduction test, and a full evolution whose waveform-reconstructed precession axis follows a post-Newtonian simple-precession model. These results establish an efficient route to spectrally resolved binary-neutron-star and black-hole--neutron-star initial data with arbitrary spin orientations.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-11 in astro-ph.IM).
Categorie arXiv: General Relativity and Quantum Cosmology (gr-qc) ; High Energy Astrophysical Phenomena (astro-ph.HE); Instrumentation and Methods for Astrophysics (astro-ph.IM).
Pagina del lavoro: https://arxiv.org/abs/2608.07653 — 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 2026-10-19T09:28:16.467Z dalla pagina https://arxiv.org/catchup/astro-ph.IM/2026-08-11?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).