Cosmological forecasts with the clustering of weak lensing peaks

Author:

Davies Christopher T1,Cautun Marius2ORCID,Giblin Benjamin3ORCID,Li Baojiu4ORCID,Harnois-Déraps Joachim56ORCID,Cai Yan-Chuan3

Affiliation:

1. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 Munich, Germany

2. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, The Netherlands

3. Scottish Universities Physics Alliance, Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH8 9YL, UK

4. Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK

5. School of Mathematics, Statistics and Physics, Newcastle University, Herschel Building, Newcastle upon Tyne NE1 7RU, UK

6. Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK

Abstract

ABSTRACT Maximizing the information that can be extracted from weak lensing (WL) measurements is a key goal for upcoming stage IV surveys. This is typically achieved through statistics that are complementary to the cosmic shear two-point correlation function, the most well established of which is the WL peak abundance. In this work, we study the clustering of WL peaks, and present parameter constraint forecasts for an lsst-like survey. We use the cosmo-SLICS wCDM simulations to measure the peak two-point correlation function for a range of cosmological parameters, and use the simulation data to train a Gaussian process regression emulator that is applied to generate likelihood contours and provide parameter constraint forecasts from mock observations. We investigate the dependence of the peak two-point correlation function on the peak height, and find that the clustering of low-amplitude peaks is complementary to that of high-amplitude peaks. Consequently, their combination gives significantly tighter constraints than the clustering of high peaks alone. The peak two-point correlation function is significantly more sensitive to the cosmological parameters h and w0 than the peak abundance, and when the probes are combined, constraints on Ωm, S8, h, and w0 improve by at least a factor of 2, relative to the peak abundance alone. Finally, we compare the forecasts for WL peaks and voids, and show that the two are also complementary; both probes can offer better constraints on S8 and w0 than the shear correlation function by roughly a factor of 2.

Funder

STFC

EU

Royal Society

ERC

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 9 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Ray-tracing versus Born approximation in full-sky weak lensing simulations of the MillenniumTNG project;Monthly Notices of the Royal Astronomical Society;2024-08-23

2. Constraining modified gravity with weak-lensing peaks;Monthly Notices of the Royal Astronomical Society;2024-08-15

3. The FLAMINGO project: baryonic impact on weak gravitational lensing convergence peak counts;Monthly Notices of the Royal Astronomical Society;2024-03-07

4. Cosmology from weak lensing peaks and minima with Subaru Hyper Suprime-Cam Survey first-year data;Monthly Notices of the Royal Astronomical Society;2024-01-10

5. Beyond 3×2-point cosmology: the integrated shear and galaxy 3-point correlation functions;Journal of Cosmology and Astroparticle Physics;2023-10-01

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