Dark Energy Survey Year 3 results: imprints of cosmic voids and superclusters in the Planck CMB lensing map

Abstract

The CMB lensing signal from cosmic voids and superclusters probes the growth of structure in the low-redshift cosmic web. In this analysis, we cross-correlated the Planck CMB lensing map with voids detected in the Dark Energy Survey Year 3 (Y3) data set ($\sim$5,000 deg${}^2$), expanding on previous measurements that used Y1 catalogues ($\sim$1,300 deg${}^2$). Given the increased statistical power compared to Y1 data, we report a $6.6\sigma$ detection of negative CMB convergence ($\kappa$) imprints using approximately 3,600 voids detected from a redMaGiC luminous red galaxy sample. However, the measured signal is lower than expected from the MICE N-body simulation that is based on the $\Lambda$CDM model (parameters ${\Omega }_{\mathrm{m}}=0.25$, ${\sigma }_8=0.8$), and the discrepancy is associated mostly with the void centre region. Considering the full void lensing profile, we fit an amplitude $A_{\kappa }={\kappa }_{\mathrm{DES}}/{\kappa }_{\mathrm{MICE}}$ to a simulation-based template with fixed shape and found a moderate $2\sigma$ deviation in the signal with $A_{\kappa }\approx 0.79\pm 0.12$. We also examined the WebSky simulation that is based on a Planck 2018 $\Lambda$CDM cosmology, but the results were even less consistent given the slightly higher matter density fluctuations than in MICE. We then identified superclusters in the DES and the MICE catalogues, and detected their imprints at the $8.4\sigma$ level; again with a lower-than-expected $A_{\kappa }=0.84\pm 0.10$ amplitude. The combination of voids and superclusters yields a $10.3\sigma$ detection with an $A_{\kappa }=0.82\pm 0.08$ constraint on the CMB lensing amplitude, thus the overall signal is $2.3\sigma$ weaker than expected from MICE.

arXiv comment14 pages, 8 figures, accepted by MNRAS after minor corrections

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