VERSUS: An excursion-set-inspired void-finder for the Stage-IV era

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ID: 322827
2026
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Abstract
Abstract We present VERSUS, a publicly available, fast void-finding algorithm designed to identify spherical underdensities in the density field that can be accurately described by excursion set predictions of the void size function. We validate the algorithm against both a synthetic distribution of particles designed to trace a known input void population, and mock galaxy sample built from a (2 h−1Gpc)3 AbacusSummit simulation populated with a realistic galaxy-halo connection, including systematic effects designed to mimic real survey data. In all cases, VERSUS demonstrates excellent performance, achieving strong agreement with theoretical predictions for the void size function across the range 25 < R [ h−1Mpc] < 61 without requiring any post-processing of the void catalogue. The code is user-friendly, modular, and readily applicable to observational survey data. Its computational efficiency further enables the use of simulation-based modelling approaches, facilitating robust and consistent cosmic void analyses with Stage-IV surveys.
Reference Key
openalex_W7171698681 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors N. Findlay, S. Nadathur
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1425
URL
https://doi.org/10.1093/mnras/stag1425
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