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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/32067
Title: The accuracy of weak lensing simulations
Authors: Hilbert, Stefan
Barreira, Alexandre
Fabbian, Giulio
Fosalba, Pablo
GIOCOLI, CARLO 
Bose, Sownak
CALABRESE, MATTEO 
CARBONE, Carmelita 
Davies, Christopher T.
Li, Baojiu
Llinares, Claudio
Monaco, Pierluigi 
Issue Date: 2020
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 493
Issue: 1
First Page: 305
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.
URI: http://hdl.handle.net/20.500.12386/32067
URL: http://arxiv.org/abs/1910.10625v2
https://academic.oup.com/mnras/article/493/1/305/5727331?login=true
ISSN: 0035-8711
DOI: 10.1093/mnras/staa281
Bibcode ADS: 2020MNRAS.493..305H
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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