title: Statistics of Intrinsic alignments and Weak Lensing
creator: Capranico, Federica
subject: 520
subject: 520 Astronomy and allied sciences
description: The content of this work is two-fold. In the first part we present a study on  the contamination of the intrinsic alignments to weak lensing measurements  in the future survey Euclid. On the grounds of the tidal torque theory, we have  adopted from the literature two related prescriptions for modeling the intrinsic  alignment signal and computed for both the resulting biases in the cosmological  parameters.We find a slight discrepancy among the two models, which both  significantly (up to > 3sigma) contaminate the estimates for Omega_m and sigma_8. The other  parameters h, ns and w appear less affected. In the second part we present results  based on an innovative statistical approach, the extreme value statistics.  We investigate up to which level the primordial non-Gaussianities parameters  fNL and gNL inherited by the bi- and trispectra of the weak lensing convergence  can be constrained by the most extreme values of the convergence field.We find  constraints of the order of 102 for fNL and 105 for gNL if individual extreme values  are considered, therefore sadly showing only a relatively weak constraining  power.
date: 2013
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/15505/1/thesis_capranico.pdf
identifier: DOI:10.11588/heidok.00015505
identifier: urn:nbn:de:bsz:16-heidok-155058
identifier:   Capranico, Federica  (2013) Statistics of Intrinsic alignments and Weak Lensing.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/15505/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng