Results 51 to 60 of about 65,765 (275)

The mass–richness relation of optically selected clusters from weak gravitational lensing and abundance with Subaru HSC first-year data [PDF]

Nippon Tenmon Gakkai obun kenkyu hokoku, 2019
Constraining the relation between the richness N and the halo mass M over a wide redshift range for optically selected clusters is a key ingredient for cluster-related science in optical surveys, including the Subaru Hyper Suprime-Cam (HSC) survey.
Ryoma Murata, M. Oguri, T. Nishimichi, M. Takada, R. Mandelbaum, S. More, M. Shirasaki, A. Nishizawa, K. Osato   +8 more
semanticscholar   +1 more source

Optical properties of null geodesics emerging from dynamical systems

European Physical Journal C: Particles and Fields, 2022
We study optical metrics via null geodesics as a central force system, deduce the related Binet equation and apply the analysis to certain solutions of Einstein’s equations with and without spherical symmetry.
D. Batic, S. Chanda, P. Guha
doaj   +1 more source

Weak gravitational lensing by multi-horizons black hole

Europhysics letters
We investigate the weak gravitational lensing caused by multi-horizon black hole (MHBH) on light. Using the Gauss-Bonnet theorem, which demonstrates that light bending is a topological and global phenomenon, we are able to deduce the deflection angle of ...
Farzan Mushtaq, Tiecheng Xia, M. Yasir, Aitazaz Ahsan   +3 more
semanticscholar   +1 more source

Gravitational lensing by a black-bounce-Reissner–Nordström spacetime

European Physical Journal C: Particles and Fields, 2022
We investigate the weak and strong deflection gravitational lensing by a black-bounce-Reissner–Nordström spacetime and obtain their lensing observables. Assuming the supermassive black holes in the Galactic Center and at the center of M87, Sgr A* and M87*
Jing Zhang, Yi Xie
doaj   +1 more source

Power Spectrum Covariance of Weak Gravitational Lensing [PDF]

, 2000
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters which govern them. At low redshifts, the non-linear gravitational evolution of large scale structure produces a non-Gaussian ...
Bernardeau F., Blandford R. D., Cooray A. R., Hamilton A. J. S., Mo H. J., Peacock J. A., Van Waerbeke L., Van Waerbeke L.   +7 more
core   +2 more sources

KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering [PDF]

, 2017
We perform a combined analysis of cosmic shear tomography, galaxy-galaxy lensing tomography, and redshift-space multipole power spectra (monopole and quadrupole) using 450 deg(2) of imaging data by the Kilo Degree Survey (KiDS-450) overlapping with two ...
S. Joudaki, C. Blake, Andrew Johnson, A. Amon, M. Asgari, A. Choi, T. Erben, K. Glazebrook, J. Harnois-Déraps, C. Heymans, H. Hildebrandt, H. Hoekstra, D. Klaes, K. Kuijken, C. Lidman, A. Mead, L. Miller, D. Parkinson, G. Poole, P. Schneider, M. Viola, C. Wolf   +21 more
semanticscholar   +1 more source

Studying galaxy troughs and ridges using weak gravitational lensing with the Kilo-Degree Survey [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We study projected underdensities in the cosmic galaxy density field known as 'troughs', and their overdense counterparts, which we call 'ridges'. We identify these regions using a bright sample of foreground galaxies from the photometric Kilo-Degree ...
M. Brouwer, V. Demchenko, J. Harnois-D'eraps, Maciej Bilicki, C. Heymans, H. Hoekstra, K. Kuijken, M. Alpaslan, S. Brough, Yan-Chuan Cai, M. Costa-Duarte, A. Dvornik, T. Erben, H. Hildebrandt, B. Holwerda, P. Schneider, C. Sifón, E. van Uitert   +17 more
semanticscholar   +1 more source

Weak deflection gravitational lensing for photons coupled to Weyl tensor in a Schwarzschild black hole

European Physical Journal C: Particles and Fields, 2018
Beyond the Einstein–Maxwell model, electromagnetic field might couple with gravitational field through the Weyl tensor. In order to provide one of the missing puzzles of the whole physical picture, we investigate weak deflection lensing for photons ...
Wei-Guang Cao, Yi Xie
doaj   +1 more source

Statistics of Weak Lensing at Small Angular Scales: Analytical Predictions for Lower Order Moments [PDF]

, 1999
Weak lensing surveys are expected to provide direct measurements of the statistics of the projected dark matter distribution. Most analytical studies of weak lensing statistics have been limited to quasilinear scales as they relied on perturbative ...
Babul, Balian, Bartelmann, Bartelmann, Bernardeau, Bernardeau, Bernardeau, Bernardeau, Bernardeau, Bhuvnesh Jain, Blandford, Boschan, Colombi, Colombi, Couchman, Davis, Diaferio, Dipak Munshi, Fry, Groth, Gunn, Hamilton, Hui, Jain, Jain, Jain, Jain, Jaroszyński, Jaroszyński, Kaiser, Kaiser, Kauffmann, Kauffmann, Lahav, Lee, Limber, Miralda-Escudé, Mo, Munshi, Munshi, Munshi, Munshi, Munshi, Munshi, Munshi, Munshi, Nityananda, Padmanabhan, Peacock, Peacock, Peebles, Premadi, Reblinsky, Refregier, Schneider, Schneider, Schneider, Scoccimarro, Scoccimarro, Stebbins, Szapudi, Szapudi, Szapudi, Valageas, Valageas, van Waerbeke, Villumsen, Wambsganss, Wambsganss, Wambsganss, Wang, White   +71 more
core   +3 more sources

Morphology of CMB fields—effect of weak gravitational lensing [PDF]

Journal of Cosmology and Astroparticle Physics, 2019
We study the morphology of the cosmic microwave background temperature and polarization fields using the shape and alignment parameters, β and α, that are constructed from the contour Minkowski tensor.
Priya Goyal, P. Chingangbam, S. Appleby
semanticscholar   +1 more source