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GLASS: Generator for Large Scale Structure

Tessore, Nicolas; Loureiro, Arthur; Joachimi, Benjamin; von Wietersheim-Kramsta, Maximilian; Jeffrey, Niall; (2023) GLASS: Generator for Large Scale Structure. The Open Journal of Astrophysics , 6 pp. 1-23. 10.21105/astro.2302.01942. Green open access

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Abstract

We present GLASS, the Generator for Large Scale Structure, a new code for the simulation of galaxy surveys for cosmology, which iteratively builds a light cone with matter, galaxies, and weak gravitational lensing signals as a sequence of nested shells. This allows us to create deep and realistic simulations of galaxy surveys at high angular resolution on standard computer hardware and with low resource consumption. GLASS also introduces a new technique to generate transformations of Gaussian random fields (including lognormal) to essentially arbitrary precision, an iterative line-of-sight integration over matter shells to obtain weak lensing fields, and flexible modelling of the galaxies sector. We demonstrate that GLASS readily produces simulated data sets with per cent-level accurate two-point statistics of galaxy clustering and weak lensing, thus enabling simulation-based validation and inference that is limited only by our current knowledge of the input matter and galaxy properties.

Type: Article
Title: GLASS: Generator for Large Scale Structure
Open access status: An open access version is available from UCL Discovery
DOI: 10.21105/astro.2302.01942
Publisher version: https://doi.org/10.21105/astro.2302.01942
Language: English
Additional information: © The Authors 2023. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/).
Keywords: Cosmology: large-scale structure, Gravitational lensing: weak, Methods: simulations
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10168631
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