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  The accuracy of weak lensing simulations

Hilbert, S., Barreira, A., Fabbian, G., Fosalba, P., Giocoli, C., Bose, S., et al. (2020). The accuracy of weak lensing simulations. Monthly Notices of the Royal Astronomical Society, 493(1), 305-319. doi:10.1093/mnras/staa281.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-7205-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-7206-3
Genre: Journal Article

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Hilbert, Stefan, Author
Barreira, Alexandre1, Author              
Fabbian, Giulio, Author
Fosalba, Pablo, Author
Giocoli, Carlo, Author
Bose, Sownak, Author
Calabrese, Matteo, Author
Carbone, Carmelita, Author
Davies, Christopher T., Author
Li, Baojiu, Author
Llinares, Claudio, Author
Monaco, Pierluigi, Author
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: We investigate the accuracy of weak lensing simulations by comparing the results of five independently developed lensing simulation codes run on the same input N-body simulation. Our comparison focuses on the lensing convergence maps produced by the codes, and in particular on the corresponding PDFs, power spectra, and peak counts. We find that the convergence power spectra of the lensing codes agree to ≲2 per cent out to scales ℓ ≈ 4000. For lensing peak counts, the agreement is better than 5 per cent for peaks with signal-to-noise ≲ 6. We also discuss the systematic errors due to the Born approximation, line-of-sight discretization, particle noise, and smoothing. The lensing codes tested deal in markedly different ways with these effects, but they none-the-less display a satisfactory level of agreement. Our results thus suggest that systematic errors due to the operation of existing lensing codes should be small. Moreover their impact on the convergence power spectra for a lensing simulation can be predicted given its numerical details, which may then serve as a validation test.

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 Dates: 2020-02-05
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa281
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 493 (1) Sequence Number: - Start / End Page: 305 - 319 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150