2004/01/21 by Eric V. Linder · 1 citation
Physics and Astronomy · #Astrophysics #Complementarity (molecular biology) #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Degeneracy (biology) #Equation of state #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational lens #Physics #Quantum mechanics #Redshift #Statistical physics #Strong gravitational lensing #Theoretical physics #Weak gravitational lensing #astro-ph
paper · pdf · doi:10.1103/physrevd.70.043534
published as Phys.Rev. D70 (2004) 043534 · 7 pages, 5 figures
arxiv created 2004/01/21 · openalex publication_date 2004/08/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation between its present value w0 and time variation wa. Quantities that have instead positive correlation and so a sensitivity direction largely orthogonal to, e.g., distance probes offer the hope of achieving tight constraints through complementarity. Such quantities are found in strong gravitational lensing observations of image separations and time delays. While degeneracy between cosmological parameters prevents full complementarity, strong lensing measurements to 1% accuracy can improve equation of state characterization by 15--50%. Next generation surveys should provide data on roughly 105 lens systems, though systematic errors will remain challenging.