scholarly journals Testing gravity on cosmological scales with cosmic shear, cosmic microwave background anisotropies, and redshift-space distortions

2019 ◽  
Vol 99 (8) ◽  
Author(s):  
Agnès Ferté ◽  
Donnacha Kirk ◽  
Andrew R. Liddle ◽  
Joe Zuntz
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Cosmic Shear ◽  
Microwave Background Anisotropies

scholarly journals KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

2020 ◽  
Vol 638 ◽  
pp. L1 ◽  
Author(s):  
S. Joudaki ◽  
H. Hildebrandt ◽  
D. Traykova ◽  
N. E. Chisari ◽  
C. Heymans ◽  
...  
Keyword(s):  
Dark Energy ◽  
Cosmic Microwave Background ◽  
Gravitational Lensing ◽  
Error Model ◽  
Calibration Error ◽  
Microwave Background ◽  
Weak Gravitational Lensing ◽  
Dark Energy Survey ◽  
Cosmic Shear ◽  
Energy Survey

We present a combined tomographic weak gravitational lensing analysis of the Kilo Degree Survey (KV450) and the Dark Energy Survey (DES-Y1). We homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for DES-Y1 based on deep public spectroscopic surveys. Adopting these revised redshifts results in a 0.8σ reduction in the DES-inferred value for S​8, which decreases to a 0.5σ reduction when including a systematic redshift calibration error model from mock DES data based on the MICE2 simulation. The combined KV450+DES-Y1 constraint on S8 = 0.762−0.024+0.025 is in tension with the Planck 2018 constraint from the cosmic microwave background at the level of 2.5σ. This result highlights the importance of developing methods to provide accurate redshift calibration for current and future weak-lensing surveys.

scholarly journals What's behind acoustic peaks in the cosmic microwave background anisotropies

2002 ◽  
Vol 110 ◽  
pp. 173-178
Author(s):  
C. Baccigalupi ◽  
A. Balbi ◽  
S. Matarrese ◽  
F. Perrotta ◽  
N. Vittorio
Keyword(s):  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Microwave Background Anisotropies
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