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First Detection of the Baryon Acoustic Oscillation (BAO) Feature in the 3-Point Correlation Function of DESI DR1 Luminous Red Galaxies

Fuente: arXiv

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Auteurs principaux:	Kamalinejad, Farshad, Slepian, Zachary, Krolewski, Alex, Greco, Alessandro, Leonard, William Ortolá, Chellino, Jessica, Reinhard, Matthew, Fernández-García, Elena, Prada, Francisco, Aguilar, J., Ahlen, S., Anand, A., Bebek, C., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Dawson, K. S., de la Macorra, A., Demina, R., Doel, P., Edelstein, J., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Huterer, D., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. Le, Manera, M., Meisner, A., Miquel, R., Newman, J. A., Percival, W. J., Poppett, C., Pérez-Ràfols, I., Samushia, L., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhao, C., Zou, H.
Format:	Preprint
Publié:	2026
Sujets:	Cosmology and Nongalactic Astrophysics
Accès en ligne:	Acceder al recurso
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_version_	1866915803840905216
author	Kamalinejad, Farshad Slepian, Zachary Krolewski, Alex Greco, Alessandro Leonard, William Ortolá Chellino, Jessica Reinhard, Matthew Fernández-García, Elena Prada, Francisco Aguilar, J. Ahlen, S. Anand, A. Bebek, C. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. Dawson, K. S. de la Macorra, A. Demina, R. Doel, P. Edelstein, J. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Herrera-Alcantar, H. K. Honscheid, K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kisner, T. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Guillou, L. Le Manera, M. Meisner, A. Miquel, R. Newman, J. A. Percival, W. J. Poppett, C. Pérez-Ràfols, I. Samushia, L. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhao, C. Zou, H.
author_facet	Kamalinejad, Farshad Slepian, Zachary Krolewski, Alex Greco, Alessandro Leonard, William Ortolá Chellino, Jessica Reinhard, Matthew Fernández-García, Elena Prada, Francisco Aguilar, J. Ahlen, S. Anand, A. Bebek, C. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. Dawson, K. S. de la Macorra, A. Demina, R. Doel, P. Edelstein, J. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Herrera-Alcantar, H. K. Honscheid, K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kisner, T. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Guillou, L. Le Manera, M. Meisner, A. Miquel, R. Newman, J. A. Percival, W. J. Poppett, C. Pérez-Ràfols, I. Samushia, L. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhao, C. Zou, H.
contents	We present the first detection of the 3-Point Correlation Function (3PCF) Baryon Acoustic Oscillation (BAO) signal from the DESI Data Release 1 (DR1) sample of Luminous Red Galaxies (LRGs), which contains over 2.1 million galaxies. Our analysis is based on a tree-level redshift-space bispectrum template, which is then transformed to position space using the Fast Fourier Transform on Logarithmic scales (FFTLog) algorithm. We detect the BAO feature with a significance of approximately $8.1σ$ using the EZmock covariance matrix and $8.5σ$ using the analytical covariance matrix, for the full LRG redshift range ($0.4<z<1.1$), denoted as the $z_{\rm full}$ sample. We use the Abacus altMTL mocks, the most precise DESI DR1 mock catalogs currently available, to validate our model. We find that our model fits the mocks well, with a small offset of $0.6\%$ in the recovered BAO scale, which we treat as a systematic error due to modeling. We measure the angle-averaged distance, $D_{\rm V}(z = 0.68)/r_{\rm d} = 15.88 \pm 0.27$ ($1.72\%$ precision) when using the covariance matrix estimated from EZmocks and $D_{\rm V}(z = 0.68)/r_{\rm d} = 15.72 \pm 0.18$ ($1.12\%$ precision) when using the analytical Gaussian covariance matrix. Our results show excellent agreement with the DESI DR1 2PCF BAO measurements as well. We also explore several other ways to estimate the error and find between $1.7$--$2.2\%$ precision on the BAO scale from the EZmock covariance matrix and between $1.1$--$1.5\%$ precision from the analytical covariance matrix. This work represents the first detection of the BAO feature in the DESI 3PCF, establishing its ability to probe the expansion history of the Universe with future DESI 3PCF measurements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2602_16134
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	First Detection of the Baryon Acoustic Oscillation (BAO) Feature in the 3-Point Correlation Function of DESI DR1 Luminous Red Galaxies Kamalinejad, Farshad Slepian, Zachary Krolewski, Alex Greco, Alessandro Leonard, William Ortolá Chellino, Jessica Reinhard, Matthew Fernández-García, Elena Prada, Francisco Aguilar, J. Ahlen, S. Anand, A. Bebek, C. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. Dawson, K. S. de la Macorra, A. Demina, R. Doel, P. Edelstein, J. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Herrera-Alcantar, H. K. Honscheid, K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kisner, T. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Guillou, L. Le Manera, M. Meisner, A. Miquel, R. Newman, J. A. Percival, W. J. Poppett, C. Pérez-Ràfols, I. Samushia, L. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhao, C. Zou, H. Cosmology and Nongalactic Astrophysics We present the first detection of the 3-Point Correlation Function (3PCF) Baryon Acoustic Oscillation (BAO) signal from the DESI Data Release 1 (DR1) sample of Luminous Red Galaxies (LRGs), which contains over 2.1 million galaxies. Our analysis is based on a tree-level redshift-space bispectrum template, which is then transformed to position space using the Fast Fourier Transform on Logarithmic scales (FFTLog) algorithm. We detect the BAO feature with a significance of approximately $8.1σ$ using the EZmock covariance matrix and $8.5σ$ using the analytical covariance matrix, for the full LRG redshift range ($0.4<z<1.1$), denoted as the $z_{\rm full}$ sample. We use the Abacus altMTL mocks, the most precise DESI DR1 mock catalogs currently available, to validate our model. We find that our model fits the mocks well, with a small offset of $0.6\%$ in the recovered BAO scale, which we treat as a systematic error due to modeling. We measure the angle-averaged distance, $D_{\rm V}(z = 0.68)/r_{\rm d} = 15.88 \pm 0.27$ ($1.72\%$ precision) when using the covariance matrix estimated from EZmocks and $D_{\rm V}(z = 0.68)/r_{\rm d} = 15.72 \pm 0.18$ ($1.12\%$ precision) when using the analytical Gaussian covariance matrix. Our results show excellent agreement with the DESI DR1 2PCF BAO measurements as well. We also explore several other ways to estimate the error and find between $1.7$--$2.2\%$ precision on the BAO scale from the EZmock covariance matrix and between $1.1$--$1.5\%$ precision from the analytical covariance matrix. This work represents the first detection of the BAO feature in the DESI 3PCF, establishing its ability to probe the expansion history of the Universe with future DESI 3PCF measurements.
title	First Detection of the Baryon Acoustic Oscillation (BAO) Feature in the 3-Point Correlation Function of DESI DR1 Luminous Red Galaxies
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2602.16134