Results 21 to 30 of about 12,289 (137)

Gravitational lensing and modified Newtonian dynamics [PDF]

, 2001
Gravitational lensing is most often used as a tool to investigate the distribution of (dark) matter in the universe, but, if the mass distribution is known a priori, it becomes, at least in principle, a powerful probe of gravity itself.
Daniel J. Mortlock, Edwin L. Turner, Qin, Tadros   +3 more
core   +8 more sources

Magnification relations for Kerr lensing and testing Cosmic Censorship [PDF]

, 2007
A Kerr black hole with mass parameter m and angular momentum parameter a acting as a gravitational lens gives rise to two images in the weak field limit.
A. O. Petters, A. O. Petters, B. O’Neill, M. C. Werner, P. Schneider, R. Penrose, S. Chandrasekhar   +6 more
core   +1 more source

3D Weak Gravitational Lensing of the CMB and Galaxies [PDF]

, 2015
In this paper we present a power spectrum formalism that combines the full three-dimensional information from the galaxy ellipticity field, with information from the cosmic microwave background (CMB).
Das, S., Heavens, A. F., Kitching, T. D.
core   +1 more source

An Exact Universal Gravitational Lensing Equation

, 1998
We first define what we mean by gravitational lensing equations in a general space-time. A set of exact relations are then derived that can be used as the gravitational lens equations in all physical situations.
A. Einstein, Ezra T. Newman, L. Landau, L. Landau, P. Schneider, Simonetta Frittelli, Simonetta Frittelli, Thomas P. Kling, V. I Arnold, V. I Arnold, V. I. Arnold   +10 more
core   +2 more sources

Shadows and photon spheres in static and rotating traversable wormholes

Nuclear Physics B
We explore the shadows and photon orbits of both static and rotating traversable wormholes by employing a redshift function in combination with two distinct shape functions.
Takol Tangphati, Phongpichit Channuie, Kazuharu Bamba, Davood Momeni   +3 more
doaj   +1 more source

Testing General Relativity with Current Cosmological Data [PDF]

, 2010
Deviations from general relativity, such as could be responsible for the cosmic acceleration, would influence the growth of large scale structure and the deflection of light by that structure.
Alexie Leauthaud, Asantha Cooray, C. M. Will, C. M. Will, Eric V. Linder, Lucas Lombriser, Robert R. Caldwell, Scott F. Daniel, Tristan L. Smith   +8 more
core   +2 more sources

Intrinsic alignments of group and cluster galaxies in photometric surveys [PDF]

, 2014
Intrinsic alignments of galaxies have been shown to contaminate weak gravitational lensing observables on linear scales, $r>$ 10 $h^{-1}$Mpc, but studies of alignments in the non-linear regime have thus far been inconclusive.
Bahcall, Neta, Chisari, Nora Elisa, Huff, Eric, Mandelbaum, Rachel, Strauss, Michael A.   +4 more
core   +2 more sources

A Novel Test for MOND: Gravitational Lensing by Disk Galaxies

The Astrophysical Journal
Disk galaxies represent a promising laboratory for the study of gravitational physics, including alternatives to dark matter (DM), owing to the possibility of coupling rotation curves’ dynamical data with strong gravitational lensing (SGL) observations ...
Christopher Harvey-Hawes, Marco Galoppo
doaj   +1 more source

Gravitational lensing in modified Newtonian dynamics

, 2001
Modified Newtonian dynamics (MOND) is an alternative theory of gravity that aims to explain large-scale dynamics without recourse to any form of dark matter.
Mortlock, Daniel J., Turner, Edwin L.
core   +2 more sources

GRAVITATIONAL LENSING EFFECT ON COSMIC MICROWAVE BACKGROUND ANISOTROPIES: A POWER SPECTRUM APPROACH [PDF]

, 1995
The effect of gravitational lensing on cosmic microwave background (CMB) anisotropies is investigated using the power spectrum approach. The lensing effect can be calculated in any cosmological model by specifying the evolution of gravitational potential.
Seljak, Uros
core   +2 more sources