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Weak lensing deflection of three-point correlation functions
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University College London, U.K..
Number of Authors: 32017 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 12, article id 043Article in journal (Refereed) Published
Abstract [en]

Weak gravitational lensing alters the apparent separations between observed sources, potentially affecting clustering statistics. We derive a general expression for the lensing deflection which is valid for any three-point statistic, and investigate its effect on the three-point clustering correlation function. We find that deflection of the clustering correlation function is greatest at around z = 2. It is most prominent in regions where the correlation function varies rapidly, in particular at the baryon acoustic oscillation scale where it smooths out the peaks and troughs, reducing the peak-to-trough difference by about 0.1 percent at z = 1 and around 2.3 percent at z = 10. The modification due to lensing deflection is typically at the per cent level of the expected errors in a Euclid-like survey and therefore undetectable.

Place, publisher, year, edition, pages
2017. no 12, article id 043
Keywords [en]
galaxy clustering, weak gravitational lensing
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-152521DOI: 10.1088/1475-7516/2017/12/043ISI: 000418922000006OAI: oai:DiVA.org:su-152521DiVA, id: diva2:1180457
Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2018-08-07Bibliographically approved

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Peiris, Hiranya V.
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