Published August 15, 2007 | Version v1
Journal article

Can strong gravitational lensing constrain dark energy?

  • 1. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (China)
  • 2. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan 11529 (China)

Description

We discuss the ratio of the angular diameter distances from the source to the lens, Dds, and to the observer at present, Ds, for various dark energy models. It is well known that the difference of Dss between the models is apparent and this quantity is used for the analysis of Type Ia supernovae. However we investigate the difference between the ratio of the angular diameter distances for a cosmological constant, (Dds/Ds)Λ, and that for other dark energy models, (Dds/Ds)other, in this paper. It has been known that there is lens model degeneracy in using strong gravitational lensing. Thus, we investigate the model independent observable quantity, Einstein radius (θE), which is proportional to both Dds/Ds and velocity dispersion squared, σv2. Dds/Ds values depend on the parameters of each dark energy model individually. However, (Dds/Ds)Λ-(Dds/Ds)other for the various dark energy models, is well within the error of σv for most of the parameter spaces of the dark energy models. Thus, a single strong gravitational lensing by use of the Einstein radius may not be a proper method to investigate the property of dark energy. However, better understanding to the mass profile of clusters in the future or other methods related to arc statistics rather than the distances may be used for constraints on dark energy

Additional details

Publishing Information

Journal Title
Physical Review. D, Particles Fields
Journal Volume
76
Journal Issue
4
Journal Page Range
p. 043518-043518.8
ISSN
0556-2821
CODEN
PRVDAQ

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
39049498
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
COSMOLOGICAL CONSTANT; COSMOLOGY; DISTANCE; ERRORS; GRAVITATIONAL LENSES; MASS; NONLUMINOUS MATTER; SPACE; STATISTICS
Descriptors DEC
LENSES; MATHEMATICS; MATTER

Optional Information

Notes
(c) 2007 The American Physical Society