The GIGANTES Data Set: Precision Cosmology from Voids in the Machine-learning Era - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2022

The GIGANTES Data Set: Precision Cosmology from Voids in the Machine-learning Era

Christina D. Kreisch
  • Function : Author
Alice Pisani
  • Function : Author
Francisco Villaescusa-Navarro
  • Function : Author
David N. Spergel
  • Function : Author
Nico Hamaus
  • Function : Author
Adrian E. Bayer
  • Function : Author


We present GIGANTES, the most extensive and realistic void catalog suite ever released-containing over 1 billion cosmic voids covering a volume larger than the observable universe, more than 20 TB of data, and created by running the void finder VIDE on QUIJOTE's halo simulations. The GIGANTES suite, spanning thousands of cosmological models, opens up the study of voids, answering compelling questions: Do voids carry unique cosmological information? How is this information correlated with galaxy information? Leveraging the large number of voids in the GIGANTES suite, our Fisher constraints demonstrate voids contain additional information, critically tightening constraints on cosmological parameters. We use traditional void summary statistics (void size function, void density profile) and the void autocorrelation function, which independently yields an error of 0.13 eV on ∑ m ν for a 1 h -3 Gpc3 simulation, without cosmic microwave background priors. Combining halos and voids we forecast an error of 0.09 eV from the same volume, representing a gain of 60% compared to halos alone. Extrapolating to next generation multi-Gpc3 surveys such as the Dark Energy Spectroscopic Instrument, Euclid, the Spectro-Photometer for the History of the Universe and Ices Explorer, and the Roman Space Telescope, we expect voids should yield an independent determination of neutrino mass. Crucially, GIGANTES is the first void catalog suite expressly built for intensive machine-learning exploration. We illustrate this by training a neural network to perform likelihood-free inference on the void size function, giving a ~20% constraint on Ωm. Cosmology problems provide an impetus to develop novel deep-learning techniques. With GIGANTES, machine learning gains an impressive data set, offering unique problems that will stimulate new techniques.
Fichier principal
Vignette du fichier
Kreisch_2022_ApJ_935_100.pdf (1.31 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03839656 , version 1 (04-11-2022)




Christina D. Kreisch, Alice Pisani, Francisco Villaescusa-Navarro, David N. Spergel, Benjamin D. Wandelt, et al.. The GIGANTES Data Set: Precision Cosmology from Voids in the Machine-learning Era. The Astrophysical Journal, 2022, 935, ⟨10.3847/1538-4357/ac7d4b⟩. ⟨insu-03839656⟩
4 View
20 Download



Gmail Mastodon Facebook X LinkedIn More