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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2025
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| author | Slepian, Zachary Krolewski, Alex Greco, Alessandro May, Simon Leonard, William Ortola Kamalinejad, Farshad Chellino, Jessica Reinhard, Matthew Fernandez, Elena Prada, Francisco Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel de Mattia, Arnaud Dey, Biprateep Doel, Peter Gaztanaga, Enrique Gutierrez, Gaston Honscheid, Klaus Huterer, Dragan Joyce, Dick Kehoe, Robert Kirkby, David Kisner, Theodore Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Nadathur, Seshadri Percival, Will Ross, Ashley Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Sprayberry, David Tarle, Gregory |
| author_facet | Slepian, Zachary Krolewski, Alex Greco, Alessandro May, Simon Leonard, William Ortola Kamalinejad, Farshad Chellino, Jessica Reinhard, Matthew Fernandez, Elena Prada, Francisco Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel de Mattia, Arnaud Dey, Biprateep Doel, Peter Gaztanaga, Enrique Gutierrez, Gaston Honscheid, Klaus Huterer, Dragan Joyce, Dick Kehoe, Robert Kirkby, David Kisner, Theodore Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Nadathur, Seshadri Percival, Will Ross, Ashley Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Sprayberry, David Tarle, Gregory |
| contents | 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$σ$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_09133 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Measurement of Parity-Violating Modes of the Dark Energy Spectroscopic Instrument (DESI) Year 1 Luminous Red Galaxies' 4-Point Correlation Function Slepian, Zachary Krolewski, Alex Greco, Alessandro May, Simon Leonard, William Ortola Kamalinejad, Farshad Chellino, Jessica Reinhard, Matthew Fernandez, Elena Prada, Francisco Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel de Mattia, Arnaud Dey, Biprateep Doel, Peter Gaztanaga, Enrique Gutierrez, Gaston Honscheid, Klaus Huterer, Dragan Joyce, Dick Kehoe, Robert Kirkby, David Kisner, Theodore Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Nadathur, Seshadri Percival, Will Ross, Ashley Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Sprayberry, David Tarle, Gregory Cosmology and Nongalactic Astrophysics 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$σ$ 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. |
| title | Measurement of Parity-Violating Modes of the Dark Energy Spectroscopic Instrument (DESI) Year 1 Luminous Red Galaxies' 4-Point Correlation Function |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2508.09133 |