The Role of Cosmological Constant in Gravitational Lensing

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Moradi, Mohsen | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39632 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Mansouri, Reza
Abstract:
In present thesis, the effect of cosmological constant, Λ, in bending of light by spherical symmetric mass has been studied. At first we obtain the Schwarzschild-de Sitter solution as spherical symmetric solution of General relativity field equations with cosmological constant, without we suppose the solution is static. Then we obtain gravitational lens equation by considering the space geometry and we benefited from several approach to specify the contribution of cosmological constant to the deflection angle. Furthermore we put new upper bounds on the value of the lambda independently of cosmological constraints. Finally for study the contribution of lambda in gravitational lensing observations consider a double image and we compute the contribution of cosmological constant in deflection angle only in terms of quantities observed in lensing cluster. More over, we compute the time delay between images in present of cosmological constant. We estimate the time delay for a lensing cluster by using it
Keywords:
General Relativity Theory ; Cosmological Constant ; Gravitational Lens ; Gravitational Deflection Angle

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