Metraipolis › archive › dc_57ffdf65de50

Field-Level Baryon Acoustic Oscillation Reconstruction of the DESI DR1 Luminous Red Galaxies with Linear Field Transformer (LiFT) — arXiv:2609.14862

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.14862
License (as archived): CC0-1.0
Archived: 2026-10-16T02:41:58.732Z
SHA-256 of the archived text: 8b4cd0c5a77f5e21dd5bc248a2204c4e4355e9c79ded51c51549397cac9279a1
Stable URL of this page: https://metraipolis.com/documento/dc_57ffdf65de50

How to cite

Field-Level Baryon Acoustic Oscillation Reconstruction of the DESI DR1 Luminous Red Galaxies with Linear Field Transformer (LiFT) — arXiv:2609.14862 — arXiv (en), https://arxiv.org/abs/2609.14862 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_57ffdf65de50 (Metraipolis archive dc_57ffdf65de50, sha256 8b4cd0c5a77f5e21dd5bc248a2204c4e4355e9c79ded51c51549397cac9279a1)

BibTeX

@misc{dc57ffdf65de50,
  title = {Field-Level Baryon Acoustic Oscillation Reconstruction of the DESI DR1 Luminous Red Galaxies with Linear Field Transformer (LiFT) — arXiv:2609.14862},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.14862},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_57ffdf65de50; sha256 8b4cd0c5a77f5e21dd5bc248a2204c4e4355e9c79ded51c51549397cac9279a1},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.14862. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

We present the first application of neural field-level baryon-acoustic oscillation (BAO) reconstruction to real spectroscopic survey data. We develop Linear Field Transformer (LiFT), a 3D vision transformer that takes as input the observed galaxy field, its standard reconstruction, and a set of context channels encoding local line of sight, survey coverage, and redshift, and learns to correct standard reconstruction toward the linear density field. We construct a forward-modeling pipeline to produce mock lightcones similar to the DESI Data Release 1 (DR1) luminous red galaxy (LRG) sample, and train LiFT on these. We validate LiFT on held-out simulations, as well as on additional mocks which differ in gravity solver, halo finder, HOD, cosmology, and fiber-assignment history, as well as on mocks analyzed with a distorted distance-redshift relation; ultimately, we find unbiased dilation parameters with consistently tighter constraints than standard reconstruction. Applied to the DESI DR1 LRGs, LiFT improves errors on $\alpha_{\rm iso}$ by 13%, 24%, and 30% and on $\alpha_{\rm AP}$ by 5%, 22%, and 30% relative to the DESI DR1 standard reconstruction analysis in the LRG1, LRG2, and LRG3 bins respectively; meanwhile, our DR1 central values remain consistent with DR1 and DR2. This equates to a factor of 1.2, 1.7 and 2.0 increase in Figure of Merit (or effective survey volume) if one were to only use standard reconstruction. Ultimately, these results establish LiFT as a validated, survey-ready tool for current and upcoming galaxy surveys.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-15 in astro-ph.IM).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; Instrumentation and Methods for Astrophysics (astro-ph.IM).
Pagina del lavoro: https://arxiv.org/abs/2609.14862 — 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 2026-10-16T02:26:21.733Z dalla pagina https://arxiv.org/catchup/astro-ph.IM/2026-09-15?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).