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Gravitational lensing by a structure in a cosmological background

Mood, M. P ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevD.88.083011
  3. Publisher: 2013
  4. Abstract:
  5. We use an exact general relativistic model structure within a Friedmann-Robertson-Walker cosmological background based on a Lemaître, Tolman, and Bondi metric to study the gravitational lensing by a cosmological and dynamical structure. Using different density profiles for the model structure, the deviation angle and the time delay through the gravitational lensing has been studied by solving the geodesic equations. The results of these exact calculations have been compared to the thin lens approximation. We have shown that the result for the thin lens approximation based on a modified Navarro-Frenk-White density profile with a void before going over to the Friedmann-Robertson-Walker background matches very well with the exact general relativistic calculations. However, the thin lens approximation based on a normal Navarro-Frenk-White profile does differ from the exact relativistic calculation. The difference is more the less compact the structure is. We have also looked at the impact of our calculation on the observational interpretation of arcs in the case of strong lensing and also the reduced shear in the case of weak lensing. No significant difference has been seen in the data available
  6. Keywords:
  8. Source: Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 88, Issue 8 , October , 2013 ; 15507998 (ISSN)
  9. URL: http://journals.aps.org/prd/abstract/10.1103/PhysRevD.88.083011