Can strong gravitational lensing constrain dark energy?
Creators
- 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
Identifiers
- DOI
- 10.1103/PhysRevD.76.043518;
- arXiv
- arXiv:0707.1730v1;
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