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 fNLloc 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 fNLloc constraints, by ∼9% to a measurement of fNLloc=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 ∼8% 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 fNLloc through its cross-correlation in preparation for future DESI data analyses.
@article{arxiv.2604.05213,
title = {Local primordial non-Gaussianity using cross-correlations of DESI tracers},
author = {A. J. Rosado-Marín and A. J. Ross and H. Seo and E. Chaussidon and J. Aguilar and S. Ahlen and D. Bianchi and D. Brooks and T. Claybaugh and A. Cuceu and A. de la Macorra and A. de Mattia and R. Demina and B. Dey and P. Doel and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and S. Gontcho A Gontcho and G. Gutierrez and C. Hahn and H. K. Herrera-Alcantar and D. Huterer and M. Ishak and R. Joyce and D. Kirkby and A. Kremin and O. Lahav and C. Lamman and M. Landriau and M. E. Levi and M. Manera and A. Meisner and R. Miquel and S. Nadathur and J. A. Newman and N. Palanque-Delabrouille and W. J. Percival and F. Prada and I. Pérez-Ràfols and G. Rossi and E. Sanchez and D. Schlegel and J. Silber and G. Tarlé and B. A. Weaver and C. Zhao and H. Zou},
journal= {arXiv preprint arXiv:2604.05213},
year = {2026}
}