# Tomographic analyses of the CMB lensing and galaxy clustering to probe the linear structure growth

## TL;DR

This paper uses a tomographic approach combining CMB lensing and galaxy data across multiple redshift bins to measure the linear growth of cosmic structures, finding results consistent with the standard cosmological model.

## Contribution

It introduces a novel tomographic analysis of CMB lensing and galaxy clustering to estimate the linear structure growth, providing new measurements across redshift bins.

## Key findings

- The structure growth amplitude is $A_{D}=1.16\u00b1 0.13$, consistent with $\u03bcla$CDM.
- No significant systematic effects detected in the analysis.
- The method effectively combines multiple datasets for cosmological insights.

## Abstract

In a tomographic approach, we measure the cross-correlation between the CMB lensing reconstructed from the Planck satellite and the galaxies of the photometric redshift catalogue based on the combination of the South Galactic Cap u-band Sky Survey (SCUSS), Sloan Digital Sky Survey (SDSS), and Wide-field Infrared Survey Explorer (WISE) data. We perform the analyses considering six redshift bins spanning the range of $0.1 <z<0.7$. From the estimates of the galaxy-galaxy and galaxy-CMB lensing power spectrum, we derive the galaxy bias and the amplitude of the cross-correlation for each redshift bin. We have finally applied these tomographic measurements to estimate the linear structure growth using the bias-independent $\hat{D}_{G}$ estimator introduced by Giannantonio et al. 2016. We find that the amplitude of the structure growth with respect to the fiducial cosmology is $A_{D}=1.16\pm 0.13$, closely consistent with the predictions of the $\Lambda$CDM model ($A_{D}^{\Lambda CDM}=1$). We perform several tests for consistency of our results, finding no significant evidence for systematic effects.