Volume 530, June 2011
|Number of page(s)||6|
|Section||Cosmology (including clusters of galaxies)|
|Published online||11 May 2011|
COSMOS weak-lensing constraints on modified gravity⋆
Centro de Astronomia e Astrofísica da Universidade de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
2 Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
Received: 6 December 2010
Accepted: 15 March 2011
The observed acceleration of the universe, explained through dark energy, could alternatively be explained through a modification of gravity that would also induce modifications in the evolution of cosmological perturbations.
We use new weak lensing data from the COSMOS survey to test for deviations from general relativity (GR). The departure from GR is parametrized in a model-independent way that consistently parametrizes the two-point cosmic shear amplitude and growth.
Using CMB priors, we perform a likelihood analysis. We find constraints on the amplitude of the signal that do not indicate a deviation from GR.
Key words: gravitational lensing: weak / large-scale structure of Universe / cosmological parameters
Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archives at the Space Telescope European Coordination Facility and the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
© ESO, 2011
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