Cross-Correlation of Planck CMB Lensing with DESI-Like LRGs

Abstract

Cross-correlations between the lensing of the cosmic microwave background (CMB) and other tracers of large-scale structure provide a unique way to reconstruct the growth of dark matter, break degeneracies between cosmology and galaxy physics, and test theories of modified gravity. We detect a cross-correlation between DESI-like luminous red galaxies (LRGs) selected from DECaLS imaging and CMB lensing maps reconstructed with the Planck satellite at a significance of $S/N=27.2$ over scales ${\ell }_{\min }=30$, ${\ell }_{\max }=1000$. To correct for magnification bias, we determine the slope of the LRG cumulative magnitude function at the faint limit as $s=0.999\pm 0.015$, and find corresponding corrections on the order of a few percent for $C_{\ell }^{\kappa g},C_{\ell }^{gg}$ across the scales of interest. We fit the large-scale galaxy bias at the effective redshift of the cross-correlation $z_{\mathrm{eff}}\approx 0.68$ using two different bias evolution agnostic models: a HaloFit times linear bias model where the bias evolution is folded into the clustering-based estimation of the redshift kernel, and a Lagrangian perturbation theory model of the clustering evaluated at $z_{\mathrm{eff}}$. We also determine the error on the bias from uncertainty in the redshift distribution; within this error, the two methods show excellent agreement with each other and with DESI survey expectations.

arXiv comment18 pages, 14 figures, 6 tables; final version accepted for publication

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