Study of the connected four-point correlation function of galaxies from the DESI Data Release 1 luminous red galaxy sample

We present a measurement of the non-Gaussian four-point correlation function (4PCF) from the DESI DR1 luminous red galaxy (LRG) sample. For the gravitationally induced parity-even 4PCF, we detect a signal with a significance of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mn>14.7</a:mn> <a:mi>σ</a:mi> </a:mrow> </a:math> using our fiducial setup. We assess the robustness of this detection through a series of validation tests, including auto and cross-correlation analyses, sky partitioning across multiple patch combinations, and variations in radial scale cuts. Due to the low completeness of the sample, we find that differences in fiber assignment implementation schemes can significantly impact estimation of the covariance and introduce biases in the data vector. After correcting for these effects, all tests yield consistent results. This is one of the first measurements of the connected 4PCF on the DESI LRG sample; the good agreement between the simulation and the data implies that the amplitude of the density fluctuation inferred from the connected 4PCF is consistent with the Planck <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mi mathvariant="normal">Λ</c:mi> <c:mi>CDM</c:mi> </c:math> cosmology. The methodology and diagnostic framework established in this work provide a foundation for interpreting parity-odd 4PCF.

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Publication Details

Journal
Physical review. D/Physical review. D.
Published
2025-11-06
DOI
https://doi.org/10.1103/1wyy-758f
Citations
2
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
2.31
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article

Study of the connected four-point correlation function of galaxies from the DESI Data Release 1 luminous red galaxy sample

Karl J. Friston
2 citations
Physical review. D/Physical review. D.
Galaxies: Formation, Evolution, Phenomena
2.31
article

Study of the connected four-point correlation function of galaxies from the DESI Data Release 1 luminous red galaxy sample

Karl J. Friston
article en
2 citations

Abstract

We present a measurement of the non-Gaussian four-point correlation function (4PCF) from the DESI DR1 luminous red galaxy (LRG) sample. For the gravitationally induced parity-even 4PCF, we detect a signal with a significance of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mn>14.7</a:mn> <a:mi>σ</a:mi> </a:mrow> </a:math> using our fiducial setup. We assess the robustness of this detection through a series of validation tests, including auto and cross-correlation analyses, sky partitioning across multiple patch combinations, and variations in radial scale cuts. Due to the low completeness of the sample, we find that differences in fiber assignment implementation schemes can significantly impact estimation of the covariance and introduce biases in the data vector. After correcting for these effects, all tests yield consistent results. This is one of the first measurements of the connected 4PCF on the DESI LRG sample; the good agreement between the simulation and the data implies that the amplitude of the density fluctuation inferred from the connected 4PCF is consistent with the Planck <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mi mathvariant="normal">Λ</c:mi> <c:mi>CDM</c:mi> </c:math> cosmology. The methodology and diagnostic framework established in this work provide a foundation for interpreting parity-odd 4PCF.

Physical review. D/Physical review. D.Vol. 112(12)
Institució Catalana de Recerca i Estudis Avançats (ES), Universitat Autònoma de Barcelona (ES), Universidad de Guanajuato (MX), Fermi National Accelerator Laboratory (US), Institute of Space Sciences (ES), Lawrence Berkeley National Laboratory (US), University of Waterloo (CA), The University of Texas at Dallas (US), University of Sussex (GB), Southern Methodist University (US), Perimeter Institute (CA), University of Milan (IT), University of Cambridge (GB), Université Paris-Saclay (FR), University of Michigan (US), Brera Astronomical Observatory (IT), University of California System (US), Sejong University (KR), University of Florida (US), Sorbonne Université (FR), Shanghai Institute for Science of Science (CN), Max Planck Institute for Extraterrestrial Physics (DE), Institut d'Estudis Espacials de Catalunya (ES), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Ohio University (US), Instituto de Estudios Avanzados (VE), Center for Astrophysics Harvard & Smithsonian (US), Barcelona Institute of Science and Technology (ES), Institut National de Physique Nucléaire et de Physique des Particules (FR), Institute of Space Science - INFLPR Subsidiary (RO), Universidad de Los Andes (BO), Instituto de Astrofísica de Andalucía (ES), National Astronomical Observatories (CN), Laboratoire Médiations (FR), Institute of Science and Technology, University College London (GB), The Ohio State University (US), University of Portsmouth (GB), Universidad Nacional Autónoma de México (MX), Universitat Politècnica de Catalunya (ES)
Openalex Percentile: Top 9%
Galaxies: Formation, Evolution, Phenomena
2.31
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