scholarly journals Measuring gravitational lensing of the cosmic microwave background using cross correlation with large scale structure

2012 ◽  
Vol 86 (6) ◽  
Author(s):  
Chang Feng ◽  
Grigor Aslanyan ◽  
Aneesh V. Manohar ◽  
Brian Keating ◽  
Hans P. Paar ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Lensing ◽  
Large Scale ◽  
Cross Correlation ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Microwave Background

scholarly journals Inflation physics from the cosmic microwave background and large scale structure

2015 ◽  
Vol 63 ◽  
pp. 55-65 ◽  
Author(s):  
K.N. Abazajian ◽  
K. Arnold ◽  
J. Austermann ◽  
B.A. Benson ◽  
C. Bischoff ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Microwave Background

scholarly journals Constraints on neutrino-dark matter interactions from cosmic microwave background and large scale structure data

2010 ◽  
Vol 81 (4) ◽  
Author(s):  
Paolo Serra ◽  
Federico Zalamea ◽  
Asantha Cooray ◽  
Gianpiero Mangano ◽  
Alessandro Melchiorri
Keyword(s):  
Dark Matter ◽  
Cosmic Microwave Background ◽  
Structure Data ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Microwave Background

scholarly journals Detection of a Cross-correlation between Cosmic Microwave Background Lensing and Low-density Points

2021 ◽  
Vol 923 (2) ◽  
pp. 153
Author(s):  
Fuyu Dong ◽  
Pengjie Zhang ◽  
Le Zhang ◽  
Ji Yao ◽  
Zeyang Sun ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Gravitational Lensing ◽  
Large Scale ◽  
Cross Correlation ◽  
Absolute Magnitude ◽  
Low Density ◽  
Microwave Background ◽  
Large Scale Structures ◽  
The Universe ◽  
Good Agreement

Abstract Low-density points (LDPs), obtained by removing high-density regions of observed galaxies, can trace the large-scale structures (LSSs) of the universe. In particular, it offers an intriguing opportunity to detect weak gravitational lensing from low-density regions. In this work, we investigate the tomographic cross-correlation between Planck cosmic microwave background (CMB) lensing maps and LDP-traced LSSs, where LDPs are constructed from the DR8 data release of the DESI legacy imaging survey, with about 106–107 galaxies. We find that, due to the large sky coverage (20,000 deg2) and large redshift depth (z ≤ 1.2), a significant detection (10σ–30σ) of the CMB lensing–LDP cross-correlation in all six redshift bins can be achieved, with a total significance of ∼53σ over ℓ ≤ 1024. Moreover, the measurements are in good agreement with a theoretical template constructed from our numerical simulation in the WMAP 9 yr ΛCDM cosmology. A scaling factor for the lensing amplitude A lens is constrained to A lens = 1 ± 0.12 for z < 0.2, A lens = 1.07 ± 0.07 for 0.2 < z < 0.4, and A lens = 1.07 ± 0.05 for 0.4 < z < 0.6, with the r-band absolute magnitude cut of −21.5 for LDP selection. A variety of tests have been performed to check the detection reliability against variations in LDP samples and galaxy magnitude cuts, masks, CMB lensing maps, multipole ℓ cuts, sky regions, and photo-z bias. We also perform a cross-correlation measurement between CMB lensing and galaxy number density, which is consistent with the CMB lensing–LDP cross-correlation. This work therefore further convincingly demonstrates that LDP is a competitive tracer of LSS.

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