Galaxy shape statistics in the effective field theory
Authors
Vlah, Z
Chisari, NE
Schmidt, F
Publication Date
2021Journal Title
Journal of Cosmology and Astroparticle Physics
ISSN
1475-7516
Publisher
IOP Publishing
Volume
2021
Issue
05
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Vlah, Z., Chisari, N., & Schmidt, F. (2021). Galaxy shape statistics in the effective field theory. Journal of Cosmology and Astroparticle Physics, 2021 (05) https://doi.org/10.1088/1475-7516/2021/05/061
Abstract
Intrinsic galaxy alignments yield an important contribution to the observed
statistics of galaxy shapes. The general bias expansion for galaxy sizes and
shapes in three dimensions has been recently described by Vlah, Chisari \&
Schmidt using the general perturbative effective field theory (EFT) framework,
in analogy to the clustering of galaxies. In this work, we present a formalism
that uses the properties of spherical tensors to project galaxy shapes onto the
observed sky in the flat-sky approximation and compute the two-point functions
at next-to-leading order as well as the leading-order three-point functions of
galaxy shapes and number counts. The resulting expressions are given in forms
that are convenient for efficient numerical implementation. For a source
redshift distribution typical of Stage IV surveys, we find that that nonlinear
intrinsic alignment contributions to galaxy shape correlations become relevant
at angular wavenumbers $l \gtrsim 100$.
Keywords
paper, galaxy surveys, gravitational lensing, power spectrum, weak gravitational lensing
Identifiers
jcap_043p_1220, jcap_043p_1220
External DOI: https://doi.org/10.1088/1475-7516/2021/05/061
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333902
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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