Power Spectrum Covariance of Weak Gravitational Lensing

2001 ◽  
Vol 554 (1) ◽  
pp. 56-66 ◽  
Author(s):  
Asantha Cooray ◽  
Wayne Hu
Keyword(s):  
Power Spectrum ◽  
Gravitational Lensing ◽  
Weak Gravitational Lensing

scholarly journals Simultaneous modelling of matter power spectrum and bispectrum in the presence of baryons

2021 ◽  
Author(s):  
Giovanni Aricó ◽  
Raul E Angulo ◽  
Carlos Hernández-Monteagudo ◽  
Sergio Contreras ◽  
Matteo Zennaro
Keyword(s):  
Power Spectrum ◽  
Gravitational Lensing ◽  
Weak Gravitational Lensing ◽  
Matter Power Spectrum ◽  
Hydrodynamical Simulations ◽  
The Impact

Abstract We demonstrate that baryonification algorithms, which displace particles in gravity-only simulations according to physically-motivated prescriptions, can simultaneously capture the impact of baryonic physics on the 2 and 3-point statistics of matter. Specifically, we show that our implementation of a baryonification algorithm jointly fits the changes induced by baryons on the power spectrum and equilateral bispectrum on scales up to k = 5h Mpc−1 and redshifts 0 ≤ z ≤ 2, as measured in six different cosmological hydrodynamical simulations. The accuracy of our fits is typically $\sim 1\%$ for the power spectrum, and for the equilateral and squeezed bispectra, which somewhat degrades to $\sim 3\%$ for simulations with extreme feedback prescriptions. Our results support the physical assumptions underlying baryonification approaches and encourage their use in interpreting weak gravitational lensing and other cosmological observables.

scholarly journals Scale dependence of galaxy biasing investigated by weak gravitational lensing: An assessment using semi-analytic galaxies and simulated lensing data

2018 ◽  
Vol 613 ◽  
pp. A15 ◽  
Author(s):  
Patrick Simon ◽  
Stefan Hilbert
Keyword(s):  
Gravitational Lensing ◽  
Spatial Scales ◽  
Scale Dependence ◽  
Reconstruction Technique ◽  
Weak Gravitational Lensing ◽  
Physical Scale ◽  
The Galaxy ◽  
Galaxy Bias ◽  
The Impact ◽  
Lens Galaxies

Galaxies are biased tracers of the matter density on cosmological scales. For future tests of galaxy models, we refine and assess a method to measure galaxy biasing as a function of physical scalekwith weak gravitational lensing. This method enables us to reconstruct the galaxy bias factorb(k) as well as the galaxy-matter correlationr(k) on spatial scales between 0.01hMpc−1≲k≲ 10hMpc−1for redshift-binned lens galaxies below redshiftz≲ 0.6. In the refinement, we account for an intrinsic alignment of source ellipticities, and we correct for the magnification bias of the lens galaxies, relevant for the galaxy-galaxy lensing signal, to improve the accuracy of the reconstructedr(k). For simulated data, the reconstructions achieve an accuracy of 3–7% (68% confidence level) over the abovek-range for a survey area and a typical depth of contemporary ground-based surveys. Realistically the accuracy is, however, probably reduced to about 10–15%, mainly by systematic uncertainties in the assumed intrinsic source alignment, the fiducial cosmology, and the redshift distributions of lens and source galaxies (in that order). Furthermore, our reconstruction technique employs physical templates forb(k) andr(k) that elucidate the impact of central galaxies and the halo-occupation statistics of satellite galaxies on the scale-dependence of galaxy bias, which we discuss in the paper. In a first demonstration, we apply this method to previous measurements in the Garching-Bonn Deep Survey and give a physical interpretation of the lens population.

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 KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing

2016 ◽  
Vol 465 (2) ◽  
pp. 1454-1498 ◽  
Author(s):  
H. Hildebrandt ◽  
M. Viola ◽  
C. Heymans ◽  
S. Joudaki ◽  
K. Kuijken ◽  
...  
Keyword(s):  
Gravitational Lensing ◽  
Cosmological Parameter ◽  
Weak Gravitational Lensing ◽  
Parameter Constraints

Current status of weak gravitational lensing

2002 ◽  
Vol 46 (12) ◽  
pp. 767-781 ◽  
Author(s):  
Henk Hoekstra ◽  
H.K.C Yee ◽  
Michael D Gladders
Keyword(s):  
Gravitational Lensing ◽  
Current Status ◽  
Weak Gravitational Lensing

scholarly journals CFHTLenS: the relation between galaxy dark matter haloes and baryons from weak gravitational lensing

2013 ◽  
Vol 437 (3) ◽  
pp. 2111-2136 ◽  
Author(s):  
Malin Velander ◽  
Edo van Uitert ◽  
Henk Hoekstra ◽  
Jean Coupon ◽  
Thomas Erben ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Weak Gravitational Lensing

Weak Gravitational Lensing by a Sample of X‐Ray–luminous Clusters of Galaxies. II. Comparison with Virial Masses

2002 ◽  
Vol 579 (1) ◽  
pp. 227-235 ◽  
Author(s):  
Ragnvald J. Irgens ◽  
Per B. Lilje ◽  
Hakon Dahle ◽  
S. J. Maddox
Keyword(s):  
Gravitational Lensing ◽  
Clusters Of Galaxies ◽  
Weak Gravitational Lensing ◽  
X Ray

scholarly journals Weak gravitational lensing: A compact object with arbitrary quadrupole moment immersed in plasma

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
Hrishikesh Chakrabarty ◽  
Askar B. Abdikamalov ◽  
Ahmadjon A. Abdujabbarov ◽  
Cosimo Bambi
Keyword(s):  
Quadrupole Moment ◽  
Gravitational Lensing ◽  
Compact Object ◽  
Weak Gravitational Lensing
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