DOE OSTI · 3011987
Parity-odd four-point correlation function from the DESI data release 1 luminous red galaxy sample
Abstract
The parity-odd four-point function provides a unique probe of fundamental symmetries and potential new physics in the large-scale structure of the Universe. We present measurements of the parity-odd four-point function using the Dark Energy Spectroscopic Instrument (DESI) DR1 luminous red galaxy (LRG) sample and assess its detection significance. Our analysis considers both auto- and cross-correlations, using two complementary approaches to the covariance: (i) the full analytic covariance matrix applied to the uncompressed data vector, and (ii) a compressed data vector combined with a hybrid covariance matrix constructed from simulations and analytic estimates. When using the full analytic covariance matrix without corrections, we observe apparent auto-correlation signals with significance up to 4𝜎. However, this excess is also consistent with a mismatch between the statistical fluctuations estimated from the simulations and those present in the real data. Our findings therefore suggest that the parity-odd signal in the current DESI DR1 LRG sample is consistent with zero. We note, however, that the low completeness of this sample may have a non-negligible impact on the detection sensitivity. Future data releases with improved completeness will be crucial for further investigation.
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Hou, Jiamin [Ludwig-Maximilians-Universität; University of Cambridge; Kavli Institute for Cosmology Cambridge; Max-Planck-Institut für Extraterrestrische Physik] (ORCID:0000000160831947), Cahn, Robert N. [Lawrence Berkeley National Laboratory], Aguilar, J. [Lawrence Berkeley National Laboratory], Ahlen, S. [Boston University], Bianchi, D. [Università degli Studi di Milano; INAF-Osservatorio Astronomico di Brera], Brooks, D. [University College London], Cahn, R. N. [Lawrence Berkeley National Laboratory], Claybaugh, T. [Lawrence Berkeley National Laboratory], Doel, P. [University College London], Forero-Romero, J. E. [Universidad de los Andes; Universidad de los Andes], Gaztañaga, E. [Institut d’Estudis Espacials de Catalunya (IEEC); University of Portsmouth; Institute of Space Sciences], Le Guillou, L. [Sorbonne Université; IN2P3; Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE)], Gutierrez, G. [Fermi National Accelerator Laboratory], Howlett, C. [University of Queensland], Huterer, D. [University of Michigan; University of Michigan], Ishak, M. [The University of Texas at Dallas], Joyce, R. [NSF NOIRLab], Kremin, A. [Lawrence Berkeley National Laboratory], Lahav, O. [University College London], Lamman, C. [The Ohio State University], Landriau, M. [Lawrence Berkeley National Laboratory], de la Macorra, A. [Universidad Nacional Autónoma de México], Miquel, R. [Institució Catalana de Recerca i Estudis Avançats; Barcelona Institute of Science and Technology], Nadathur, S. [University of Portsmouth], Niz, G. [Universidad de Guanajuato; Instituto Avanzado de Cosmología A. C.], Percival, W. J. [University of Waterloo; Perimeter Institute for Theoretical Physics; University of Waterloo], Prada, F. [Instituto de Astrofísica de Andalucía (CSIC)], Pérez-Ràfols, I. [Universitat Politècnica de Catalunya], Rossi, G. [Sejong University], Sanchez, E. [CIEMAT], Schlegel, D. [Lawrence Berkeley National Laboratory], Schubnell, M. [University of Michigan; University of Michigan], Seo, H. [Ohio University], Silber, J. [Lawrence Berkeley National Laboratory], Sprayberry, D. [NSF NOIRLab], Tarlé, G. [University of Michigan], Weaver, B. A. [NSF NOIRLab], Zou, H. [National Astronomical Observatories]. 2026-05-04. Parity-odd four-point correlation function from the DESI data release 1 luminous red galaxy sample. https://doi.org/10.1103/2dmd-hyt1
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