eprintid: 15505
rev_number: 12
eprint_status: archive
userid: 806
dir: disk0/00/01/55/05
datestamp: 2013-09-16 06:55:09
lastmod: 2013-10-04 09:27:56
status_changed: 2013-09-16 06:55:09
type: doctoralThesis
metadata_visibility: show
creators_name: Capranico, Federica
title: Statistics of Intrinsic alignments and Weak Lensing
subjects: 520
divisions: 130001
adv_faculty: af-13
abstract: 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
id_scheme: DOI
id_number: 10.11588/heidok.00015505
ppn_swb: 1653012919
own_urn: urn:nbn:de:bsz:16-heidok-155058
date_accepted: 2013-07-25
advisor: HASH(0x564e154e0310)
language: eng
bibsort: CAPRANICOFSTATISTICS2013
full_text_status: public
citation:   Capranico, Federica  (2013) Statistics of Intrinsic alignments and Weak Lensing.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/15505/1/thesis_capranico.pdf