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|Title:||Hubble constant and dark energy inferred from free-form determined time delay distances||Authors:||Sereno, Mauro
|Issue Date:||2014||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||437||Issue:||1||First Page:||600||Abstract:||Time delays between multiple images of lensed sources can probe the geometry of the universe. We propose a novel method based on free-form modelling of gravitational lenses to estimate time delay distances and, in turn, cosmological parameters. This approach does not suffer from the degeneracy between the steepness of the profile and the cosmological parameters. We apply the method to 18 systems having time delay measurements and find H<SUB>0</SUB> = 69 ± 6(stat.) ± 4(syst.) km s<SUP>-1</SUP>Mpc<SUP>-1</SUP>. In combination with Wilkinson Microwave Anisotropy Probe 9, the constraints on dark energy are Ω<SUB>w</SUB> = 0.68 ± 0.05 and w = -0.86 ± 0.17 in a flat model with constant equation of state.||Description:||DP acknowledges financial support from Agence Nationale de la Recherche ANR-09-BLAN-0234. This research has made use of NASA's Astrophysics Data System.||URI:||http://hdl.handle.net/20.500.12386/12150||ISSN:||0035-8711||DOI:||10.1093/mnras/stt1938||Bibcode ADS:||2014MNRAS.437..600S|
|Appears in Collections:||1.01 Articoli in rivista|
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