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Measurement of Parity-Violating Modes of the Dark Energy Spectroscopic Instrument (DESI) Year 1 Luminous Red Galaxies' 4-Point Correlation Function

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arxiv 2508.09133 v1 pith:34ZKDKGY submitted 2025-08-12 astro-ph.CO

Measurement of Parity-Violating Modes of the Dark Energy Spectroscopic Instrument (DESI) Year 1 Luminous Red Galaxies' 4-Point Correlation Function

Zachary Slepian , Alex Krolewski , Alessandro Greco , Simon May , William Ortola Leonard , Farshad Kamalinejad , Jessica Chellino , Matthew Reinhard
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Elena Fernandez Francisco Prada Steven Ahlen Davide Bianchi David Brooks Todd Claybaugh Axel de la Macorra Arnaud de Mattia Biprateep Dey Peter Doel Enrique Gaztanaga Gaston Gutierrez Klaus Honscheid Dragan Huterer Dick Joyce Robert Kehoe David Kirkby Theodore Kisner Martin Landriau Laurent Le Guillou Marc Manera Aaron Meisner Ramon Miquel Seshadri Nadathur Will Percival Ashley Ross Eusebio Sanchez David Schlegel Michael Schubnell Hee-Jong Seo Joseph Silber David Sprayberry Gregory Tarle
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Here we report the first measurement of the parity-violating (PV) 4-Point Correlation Function (4PCF) of the Dark Energy Spectroscopic Instrument's Year 1 Luminous Red Galaxy (DESI Y1 LRG) sample, motivated by the potential detection of the PV 4PCF in the Sloan Digital Sky Survey Baryon Oscillation Spectroscopic Survey (SDSS BOSS) galaxies. In our auto-correlation ("auto") analysis, we find a statistically significant excess of the PV signal compared to mocks without any PV, at 4-10$\sigma$ depending on details of the analysis. This could arise either from genuine PV or from an underestimation of the variance in the mocks; it is unlikely to arise, at the signal level, from a systematic. We then cross-correlate ("cross") the putative PV signal between different, independent patches of sky, and there find no detection of parity violation. The two measurements are in significant tension: while the cross has somewhat larger error bars than the auto, this is not sufficient to explain the discrepancy. We thus present the current work as an intriguing addition to the PV work on BOSS and as motivation for exploring further the relationship between the auto and cross PV 4PCF analyses.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Testing parity with composite-field spectra of BOSS and DESI luminous red galaxies

    astro-ph.CO 2026-04 accept novelty 7.0

    No evidence for cosmological parity violation is found in the first kurto-spectrum analysis of BOSS DR12 and DESI DR1 luminous red galaxies.

  2. Unitary and Analytic Renormalisation of Cosmological Correlators

    hep-th 2025-09 unverdicted novelty 7.0

    Different dimensional regularization schemes agree with each other and with unitarity; new analytic eta regulators simplify the work and fix the imaginary part of one-loop coefficients by the logarithmic running of th...

  3. Probing Parity Violation with Weak Lensing Trispectrum

    astro-ph.CO 2026-07 conditional novelty 6.0

    A parity-odd weak lensing convergence trispectrum is derived and forecast to be detectable with DES Y3/LSST Y10-like surveys under optimistic template amplitudes.

  4. Parity Violation in Galaxy Shapes: Primordial Non-Gaussianity

    astro-ph.CO 2025-09 conditional novelty 6.0

    The parity-odd intrinsic alignment power spectrum probes the collapsed limit of the parity-odd primordial trispectrum and can tighten constraints on parity-violating PNG when bias parameters are calibrated from N-body...

  5. Fast Graph-based Higher-Order Clustering Statistics on the GPU

    astro-ph.IM 2026-07 accept novelty 5.5

    GRAMSCI v2 replaces binary-search N-point enumeration with O(m) merge-walks, adds parity-decomposed and connected 4pCF, and ports the query engine to OpenACC GPUs with out-of-core tiling.