Results 21 to 30 of about 1,077 (214)
Weak gravitational lensing [PDF]
, 2008 In this brief review I consider the advances made in weak gravitational lensing over the last 8 years, concentrating on the large scales - cosmic shear.
Heavens, A, A. Heavens
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The imprint of f(R) gravity on weak gravitational lensing – II. Information content in cosmic shear statistics [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 We investigate the information content of various cosmic shear statistics on the theory of gravity. Focusing on the Hu-Sawicki-type $f(R)$ model, we perform a set of ray-tracing simulations and measure the convergence bispectrum, peak counts and Minkowski functionals.
Shirasaki, Masato +3 more
openaire +3 more sources
Metadetection Weak Lensing for the Vera C. Rubin Observatory
The Open Journal of Astrophysics, 2023 Forthcoming astronomical imaging surveys will use weak gravitational lensing shear as a primary probe to study dark energy, with accuracy requirements at the 0.1% level.
Erin S. Sheldon +4 more
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CMB as a Probe of New Physics and Old Times [PDF]
, 2013 Cosmic birefringence (CB)---a rotation of photon-polarization plane in vacuum---is a generic signature of new scalar fields that could provide dark energy. Previously, WMAP observations excluded a uniform CB-rotation angle larger than a degree.
Gluščević, Vera
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Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT We investigate the performance of the metacalibration shear calibration framework using simulated imaging data for the Nancy Grace Roman Space Telescope (Roman) reference High-Latitude Imaging Survey (HLIS). The weak lensing programme of Roman requires the mean weak lensing shear estimate to be calibrated within about 0.03 per ...
Masaya Yamamoto +7 more
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Simulations of weak gravitational lensing – II. Including finite support effects in cosmic shear covariance matrices [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 (Abridged) We investigate and quantify the impact of finite simulation volume on weak lensing two- and four-point statistics. These {\it finite support} (FS) effects are modelled for several estimators, simulation box sizes and source redshifts, and validated against a new large suite of 500 $N$-body simulations.
Harnois-Déraps, J, van Waerbeke, L
openaire +2 more sources
Source Distributions of Cosmic Shear Surveys in Efficiency Space
The Open Journal of Astrophysics, 2020 We show that the lensing efficiency of cosmic shear generically has a simple shape, even in the case of a tomographic survey with badly behaved photometric redshifts.
Nicolas Tessore, Ian Harrison
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Dark Matter Sterile Neutrino from Scalar Decays
Universe, 2021 We place constraints on DM sterile neutrino scalar decay production (SDP) assuming that sterile neutrinos representa fraction from the total Cold Dark Matter energy density. For the cosmological analysis we complement the CMB anisotropy measurements with
Lucia Aurelia Popa
doaj +1 more source
Strong gravitational lensing by multiple galaxies [PDF]
, 2001 We discuss strong gravitational lensing by multiple objects along any line of sight. The probability for strong gravitational lensing by more than one lens is small, but a number of strong lens systems in which more than one separate lens contribute ...
Moller, Ole, Blain, A. W.
core +1 more source
A NEW METHOD FOR MEASURING WEAK GRAVITATIONAL LENSING SHEAR USING HIGHER ORDER SPIN-2 HOLICs [PDF]
The Astrophysical Journal, 2009 Accepted for publication in ApJ; 10 pages, 7 figures, uses aastex ...
Okura, Yuki, Futamase, Toshifumi
openaire +2 more sources