Lensing effects in inhomogeneous cosmological models

Details Lensing effects in inhomogeneous cosmological models Lensing effects in inhomogeneous cosmological models

2009-01-03

arxiv.org/abs/0901.0340v1

Phys.Rev.D79:102002,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 8 figures

Scientific paper

10.1103/PhysRevD.79.102002

Concepts developed in the gravitational lensing techniques such as shear, convergence, tangential and radial arcs maybe used to see how tenable inhomogeneous models proposed to explain the acceleration of the universe models are. We study the widely discussed LTB cosmological models. It turns out that for the observer sitting at origin of a global LTB solution the shear vanishes as in the FRW models, while the value of convergence is different which may lead to observable cosmological effects. We also consider Swiss-cheese models proposed recently based on LTB with an observer sitting in the FRW part. It turns out that they have different behavior as far as the formation of radial and tangential arcs are concerned.

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