Publication : t13/292

Cosmic shear full nulling: sorting out dynamics, geometry and systematics

Bernardeau F. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Nishimichi T. (Institut d\'Astrophysique de Paris (IAP-CNRS), 98 bis Bld Arago, F-75014 Paris, FRANCE)
Taruya A. (Research Center for the Early Universe, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan)
An explicit full nulling scheme for cosmic shear observations is presented. It makes possible the construction of shear maps from extended source distributions for which the lens distance distribution is restricted to a definite interval. Such a construction allows to build totally independent shear maps, at all scales, that can be taken advantage of to constrain background cosmological parameters and systematics using the full statistical power of cosmic shear observations. Another advantage of such construction is that, as the lens redshift distribution can be made arbitrarily narrow, scale mixing due to projection effects can be limited allowing controlled predictions on the large scale shear power spectrum from perturbation theory calculations.
Année de publication : 2014
Revue : Mon. Not. R. Astron. Soc. 445 (2) 1526-1537 (2014)
DOI : 10.1093/mnras/stu1861
Preprint : arXiv:1312.0430
Keywords : Cosmology, Cosmic Shear, nulling, perturbation theory
Langue : Anglais

Fichier(s) à télécharger :
  • publi.pdf


    Retour en haut