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Role of Λ in the cosmological lens equation


Sereno, M (2009). Role of Λ in the cosmological lens equation. Physical Review Letters, 102(2):021301.

Abstract

The cosmological constant Λ affects cosmological gravitational lensing. Effects due to Λ can be studied in the framework of the Schwarzschild–de Sitter spacetime. Two novel contributions, which cannot be accounted for by a proper use of angular diameter distances, are derived. First, a term δα̂Λ=2mbΛ/3 has to be added to the bending angle, where m is the lens mass and b the impact parameter. Second, Λ brings about a difference in the redshifts of multiple images. Both effects are quite small for real astrophysical systems, δα̂Λ≲1μarcsec and Δzs≲10-7.

Abstract

The cosmological constant Λ affects cosmological gravitational lensing. Effects due to Λ can be studied in the framework of the Schwarzschild–de Sitter spacetime. Two novel contributions, which cannot be accounted for by a proper use of angular diameter distances, are derived. First, a term δα̂Λ=2mbΛ/3 has to be added to the bending angle, where m is the lens mass and b the impact parameter. Second, Λ brings about a difference in the redshifts of multiple images. Both effects are quite small for real astrophysical systems, δα̂Λ≲1μarcsec and Δzs≲10-7.

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Additional indexing

Other titles:The role of Lambda in the cosmological lens equation
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:January 2009
Deposited On:27 Feb 2010 13:23
Last Modified:21 Nov 2017 14:43
Publisher:American Physical Society
ISSN:0031-9007
Funders:Swiss NSF, Tomalla Foundation
Publisher DOI:https://doi.org/10.1103/PhysRevLett.102.021301
Related URLs:http://arxiv.org/abs/0807.5123

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Content: Accepted Version
Filetype: PDF (Accepted manuscript, Version 1)
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