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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Towards Accurate Field-Level Inference of Massive Cosmic Structures

Stephen Stopyra
  • Fonction : Auteur
Hiranya V Peiris
  • Fonction : Auteur
Andrew Pontzen
  • Fonction : Auteur
Jens Jasche
  • Fonction : Auteur
Guilhem Lavaux

Résumé

We investigate the accuracy requirements for field-level inference of cluster masses and void sizes using data from galaxy surveys. We introduce a two-step framework that takes advantage of the fact that cluster masses are determined by flows on larger scales than the clusters themselves. First, we determine the integration accuracy required to perform field-level inference of cosmic initial conditions on these large scales, by fitting to late-time galaxy counts using the Bayesian Origin Reconstruction from Galaxies (BORG) algorithm. A 20-step COLA integrator is able to accurately describe the density field surrounding the most massive clusters in the Local Super-Volume ($<135\,h^{-1}\mathrm{Mpc}$), but does not by itself lead to converged virial mass estimates. Therefore we carry out `posterior resimulations', using full $N$-body dynamics while sampling from the inferred initial conditions, and thereby obtain estimates of masses for nearby massive clusters. We show that these are in broad agreement with existing estimates, and find that mass functions in the Local Super-Volume are compatible with $\Lambda$CDM.
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hal-04096343 , version 1 (21-04-2024)

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Stephen Stopyra, Hiranya V Peiris, Andrew Pontzen, Jens Jasche, Guilhem Lavaux. Towards Accurate Field-Level Inference of Massive Cosmic Structures. Monthly Notices of the Royal Astronomical Society, 2023, 527 (1), pp.1244-1256. ⟨10.1093/mnras/stad3170⟩. ⟨hal-04096343⟩
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