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08 February 2025
 
  » arxiv » 1609.0101

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Baryon effects on void statistics in the EAGLE simulation
Enrique Paillas ; Claudia D.P. Lagos ; Nelson Padilla ; Patricia Tissera ; John Helly ; Matthieu Schaller ;
Date 1 Sep 2016
AbstractCosmic voids are promising tools for cosmological tests due to their sensitivity to dark energy, modified gravity and alternative cosmological scenarios. Most previous studies in the literature of void properties use cosmological N-body simulations of dark matter (DM) particles that ignore the potential effect of baryonic physics. We analyse voids in the mass and subhalo density field in the EAGLE simulations, which follow the evolution of galaxies in a Lambda cold dark matter Universe with state-of-the-art subgrid models for baryonic processes. We study the effect of baryons on void statistics by comparing results with simulations that only follow the evolution of DM, but use the same initial conditions as EAGLE. When using the mass in the simulation, we find that a DM-only simulation produces 24 per cent more voids than a hydrodynamical one, but this difference comes mainly from voids with radii smaller than 5 Mpc. We do not find significant differences in the density profiles between voids in EAGLE and its DM-only counterpart. However, voids traced by galaxies selected by a stellar mass cut have different properties than voids traced by a sample of subhaloes with the same number density in a DM-only simulation. We conclude that the effects of modified gravity theories on void properties are well captured in DM-only simulations, with baryons having minimal effects. However, it is important to account for how galaxies populate DM haloes to estimate the observational effect of different modified gravity theories on the statistics of voids.
Source arXiv, 1609.0101
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