The Accuracy of Weak Lensing Simulations
| العنوان: | The Accuracy of Weak Lensing Simulations |
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| المؤلفون: | Pablo Fosalba, Baojiu Li, Sownak Bose, Alexandre Barreira, Carmelita Carbone, Giulio Fabbian, Claudio Llinares, Stefan Hilbert, Matteo Calabrese, Christopher Davies, Pierluigi Monaco, Carlo Giocoli |
| المساهمون: | Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Durham University, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, Hilbert, S., Barreira, A., Fabbian, G., Fosalba, P., Giocoli, C., Bose, S., Calabrese, M., Carbone, C., Davies, C. T., Li, B., Llinares, C., Monaco, P. |
| المصدر: | Mon.Not.Roy.Astron.Soc. Mon.Not.Roy.Astron.Soc., 2020, 493 (1), pp.305-319. ⟨10.1093/mnras/staa281⟩ Monthly notices of the Royal Astronomical Society, 2020, Vol.493(1), pp.305-319 [Peer Reviewed Journal] Digital.CSIC. Repositorio Institucional del CSIC instname Monthly Notices of the Royal Astronomical Society |
| بيانات النشر: | HAL CCSD, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | QB991.L37, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Discretization, Gravitational lensing, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Noise (electronics), Spectral line, methods: numerical, gravitational lensing: weak, QB0980, cosmology: theory, 0103 physical sciences, Convergence (routing), Born approximation, 010303 astronomy & astrophysics, Weak gravitational lensing, QB, Physics, 010308 nuclear & particles physics, Numerical - cosmology, Weak-methods, Astronomy and Astrophysics, Theory - largescale structure of Universe, Computational physics, Gravitational lens, Space and Planetary Science, large-scale structure of Universe, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Smoothing, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | 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. The simulations and some of the analyses in this work used the DiRAC facility, managed by the Institute for Computational Cosmology, Durham University on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk). The equipment was funded by BEIS via STFC capital grants ST/K00042X/1, ST/P002293/1, ST/R002371/1, and ST/S002502/1, Durham University, and STFC operation grant ST/R000832/1. DiRAC is part of the UK National e-Infrastructure. We thank Peter Schneider for useful comments. SH acknowledges support by the DFG cluster of excellence ‘Origin and Structure of the Universe’ (www.universe-cluster.de). AB acknowledges support from the starting grant (ERC-2015-STG 678652) ‘GrInflaGal’ of the European Research Council. GF acknowledges support from the CNES postdoctoral fellowship and support by the UK STFC grant ST/P000525/1 as well as by the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013) ERC Grant Agreement No. [616170]. PF acknowledges support from MINECO through grant ESP2017-89838-C3-1-R, the European Union H2020-COMPET-2017 grant Enabling Weak Lensing Cosmology, and Generalitat de Catalunya through grant 2017-SGR-885. CG acknowledges the grants ASI n.I/023/12/0, ASI-INAF n. 2018-23-HH.0, and PRIN MIUR 2015 Cosmology and Fundamental Physics: illuminating the Dark Universe with Euclid’. MC carried out part of this work while supported by a grant of the EU-ESF, the Autonomous Region of the Aosta Valley, and the Italian Ministry of Labour and Social Policy (CUP B36G15002310006), and by a 2019 ‘Research and Education’ grant from Fondazione CRT. The OAVdA is managed by the Fondazione Clément Fillietroz-ONLUS, which is supported by the Regional Government of the Aosta Valley, the Town Municipality of Nus, and the ‘Unité des Communes valdôtaines Mont-Émilius’. CTD is funded by a Science and Technology Facilities Council (STFC) PhD studentship through grant ST/R504725/1. BL is supported by an ERC Starting Grant, ERC-StG-PUNCA-716532, and is additionally supported by the STFC Consolidated Grants (ST/P000541/1). |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bd7e284acc6479c80ad8410944a9e26 https://hal.archives-ouvertes.fr/hal-02418295 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....5bd7e284acc6479c80ad8410944a9e26 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00358711 |
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