First investigation of void statistics in numerical relativity simulations
arxiv(2024)
摘要
We apply and extend standard tools for void statistics to cosmological
simulations that solve Einstein's equations with numerical relativity (NR). We
obtain a simulated void catalogue without Newtonian approximations, using a new
watershed void finder which operates on fluid-based NR simulations produced
with the Einstein Toolkit. We compare and contrast measures of void size and
void fraction, and compare radial stacked density profiles to
empirically-derived Hamaus-Sutter-Wandelt (HSW) density profiles and profiles
based on distance to void boundaries. We recover statistics roughly consistent
with Newtonian N-body simulations where such a comparison is meaningful. We
study variation of dynamical spatial curvature and local expansion explicitly
demonstrating the spatial fluctuations of these quantities in void regions. We
find that voids in our simulations expand 10-30
average and the kinetic curvature density parameter in the centre of voids
reaches 60-80
results are consistent with the parameters of the Timescape model of
cosmological backreaction.
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