Disentangling dark sector models using weak lensing statistics
Date Issued
2015
Author(s)
•
Metcalf, R. Benton
•
BALDI, MARCO
•
•
•
Petkova, Margarita
Description
We thank the anonymous referee for her/his useful comments that help to improve the presentation of our results. CG thanks CNES for its financial support. CG and RBM's research is part of the project GLENCO, funded under the European Seventh Framework Programme, Ideas, Grant Agreement n. 259349. MB acknowledges support by the Marie Curie Intra European Fellowship ‘SIDUN’ within the 7th Framework Programme of the European Commission. We acknowledge financial contributions from contracts ASI/INAF I/023/12/0 and by the PRIN MIUR 2010-2011 ‘The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid’. CG, MB and LM also acknowledge the financial contribution by the PRIN INAF 2012 ‘The Universe in the box: multiscale simulations of cosmic structure’. We also thank Cosimo Fedeli, Federico Marulli, Michele Moresco and Mauro Roncarelli for useful discussions. GC thank Giulia Despali, Giuseppe Tormen and Vincenzo Mezzalira to have host part of the computer jobs run to perform the ray tracing.
Abstract
We perform multiplane ray tracing using the GLAMER gravitational lensing code within high-resolution light-cones extracted from the CoDECS simulations: a suite of cosmological runs featuring a coupling between dark energy and cold dark matter (CDM). We show that the presence of the coupling is evident not only in the redshift evolution of the normalization of the convergence power spectrum, but also in differences in non-linear structure formation with respect to ΛCDM. Using a tomographic approach under the assumption of a ΛCDM cosmology, we demonstrate that weak lensing measurements would result in a σ8 value that changes with the source redshift if the true underlying cosmology is a coupled dark energy (cDE) one. This provides a generic null test for these types of models. We also find that different models of cDE can show either an enhanced or a suppressed correlation between convergence maps with differing source redshifts as compared to ΛCDM. This would provide a direct way to discriminate between different possible realizations of the cDE scenario. Finally, we discuss the impact of the coupling on several lensing observables for different source redshifts and angular scales with realistic source redshift distributions for current ground-based and future space-based lensing surveys.
Volume
452
Issue
3
Start page
2757
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.452.2757G
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
stv1473.pdf
Size
6.05 MB
Format
Adobe PDF
Checksum (MD5)
78d147de5e0248dc62f70481d0ba62e6