Abstract
ABSTRACT Do void statistics contain information beyond the tracer 2-point correlation function? Yes! As we vary the sum of the neutrino masses, we find void statistics contain information absent when using just tracer 2-point statistics. Massive neutrinos uniquely affect cosmic voids. We explore their impact on void clustering using both the DEMNUni and MassiveNuS simulations. For voids, neutrino effects depend on the observed void tracers. As the neutrino mass increases, the number of small voids traced by cold dark matter particles increases and the number of large voids decreases. Surprisingly, when massive, highly biased, haloes are used as tracers, we find the opposite effect. The scale at which voids cluster, as well as the void correlation, is similarly sensitive to the sum of neutrino masses and the tracers. This scale-dependent trend is not due to simulation volume or halo density. The interplay of these signatures in the void abundance and clustering leaves a distinct fingerprint that could be detected with observations and potentially help break degeneracies between different cosmological parameters. This paper paves the way to exploit cosmic voids in future surveys to constrain the mass of neutrinos.
Highlights
The cosmic web (Bond et al 1996) is a powerful tool to constrain neutrino properties
We note that we have analyzed void catalogs built from the mock HOD3 galaxy catalog obtained from the Dark Energy and Massive Neutrino Universe Project (DEMNUni) simulations
We have explored the impact of the sum of neutrino masses Σmν on void properties with the N-body simulations DEMNUni and MassiveNuS
Summary
The cosmic web (Bond et al 1996) is a powerful tool to constrain neutrino properties. Voids are a complementary probe to measurements of the cosmic microwave background and galaxy clustering and can help break existing degeneracies between cosmological parameters, becoming increasingly popular to study with both simulations and observations Cosmological observables provide stringent upper bounds on the sum of neutrino masses, Σmν (see e.g. Planck Collaboration et al 2018), and may soon determine the last missing parameter in the standard model. Neutrinos do not cluster on scales smaller than their free-streaming length, which is a function of the mass mν of the single neutrino species (Lesgourgues & Pastor 2006). Neutrino free-streaming scales for Σmν of interest fall within the range of typical void sizes, making voids an interesting tool for studying neutrinos
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