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Local primordial non-Gaussianity using cross-correlations of DESI tracers

Fuente: arXiv

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Main Authors:	Rosado-Marín, A. J., Ross, A. J., Seo, H., Chaussidon, E., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., de la Macorra, A., de Mattia, A., Demina, R., Dey, B., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Hahn, C., Herrera-Alcantar, H. K., Huterer, D., Ishak, M., Joyce, R., Kirkby, D., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Newman, J. A., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Silber, J., Tarlé, G., Weaver, B. A., Zhao, C., Zou, H.
Format:	Preprint
Published:	2026
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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_version_	1866910107358461952
author	Rosado-Marín, A. J. Ross, A. J. Seo, H. Chaussidon, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. de Mattia, A. Demina, R. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Herrera-Alcantar, H. K. Huterer, D. Ishak, M. Joyce, R. Kirkby, D. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Levi, M. E. Manera, M. Meisner, A. Miquel, R. Nadathur, S. Newman, J. A. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Silber, J. Tarlé, G. Weaver, B. A. Zhao, C. Zou, H.
author_facet	Rosado-Marín, A. J. Ross, A. J. Seo, H. Chaussidon, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. de Mattia, A. Demina, R. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Herrera-Alcantar, H. K. Huterer, D. Ishak, M. Joyce, R. Kirkby, D. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Levi, M. E. Manera, M. Meisner, A. Miquel, R. Nadathur, S. Newman, J. A. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Silber, J. Tarlé, G. Weaver, B. A. Zhao, C. Zou, H.
contents	We constrain local primordial non-Gaussianity by a combined analysis of auto and cross-correlations of DESI DR1 tracers, leveraging LRGs and QSOs as well as ELGs between $0.8<z<3.1$. By cross-validating the signal across different clustering tracers within the same redshift range, we evaluate potential systematics in the $f^\mathrm{loc}_\mathrm{NL}$ measurements, capitalizing on the reduced susceptibility of cross-correlations to non-common systematics. We find that the cross-correlation between LRG and quasars can robustly improve the DESI DR1 $f^\mathrm{loc}_\mathrm{NL}$ constraints, by $\sim9\%$ to a measurement of $f^\mathrm{loc}_\mathrm{NL}=2.1_{-8.3}^{+8.8}$ at 68\% confidence. On the other hand, we do not find a clear improvement when including the DESI DR1 ELG sample. Mock tests predict an additional $\sim8\%$ gain with statistical scatter, and the lack of improvement in the data remains consistent with this expectation. This project serves as an exploratory analysis of DESI ELG clustering for $f^\mathrm{loc}_\mathrm{NL}$ through its cross-correlation in preparation for future DESI data analyses.
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_05213
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Local primordial non-Gaussianity using cross-correlations of DESI tracers Rosado-Marín, A. J. Ross, A. J. Seo, H. Chaussidon, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cuceu, A. de la Macorra, A. de Mattia, A. Demina, R. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Herrera-Alcantar, H. K. Huterer, D. Ishak, M. Joyce, R. Kirkby, D. Kremin, A. Lahav, O. Lamman, C. Landriau, M. Levi, M. E. Manera, M. Meisner, A. Miquel, R. Nadathur, S. Newman, J. A. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Silber, J. Tarlé, G. Weaver, B. A. Zhao, C. Zou, H. Cosmology and Nongalactic Astrophysics We constrain local primordial non-Gaussianity by a combined analysis of auto and cross-correlations of DESI DR1 tracers, leveraging LRGs and QSOs as well as ELGs between $0.8<z<3.1$. By cross-validating the signal across different clustering tracers within the same redshift range, we evaluate potential systematics in the $f^\mathrm{loc}_\mathrm{NL}$ measurements, capitalizing on the reduced susceptibility of cross-correlations to non-common systematics. We find that the cross-correlation between LRG and quasars can robustly improve the DESI DR1 $f^\mathrm{loc}_\mathrm{NL}$ constraints, by $\sim9\%$ to a measurement of $f^\mathrm{loc}_\mathrm{NL}=2.1_{-8.3}^{+8.8}$ at 68\% confidence. On the other hand, we do not find a clear improvement when including the DESI DR1 ELG sample. Mock tests predict an additional $\sim8\%$ gain with statistical scatter, and the lack of improvement in the data remains consistent with this expectation. This project serves as an exploratory analysis of DESI ELG clustering for $f^\mathrm{loc}_\mathrm{NL}$ through its cross-correlation in preparation for future DESI data analyses.
title	Local primordial non-Gaussianity using cross-correlations of DESI tracers
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2604.05213