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DEMNUni: disentangling dark energy from massive neutrinos with the void size function

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arxiv 2212.09740 v2 pith:EMA65LBC submitted 2022-12-19 astro-ph.CO

Giovanni Verza , Carmelita Carbone , Alice Pisani , Alessandro Renzi This is my paper · ORCID
classification astro-ph.CO
keywords darkenergyfunctionmassiveneutrinossizevoidcosmological
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Cosmic voids, the underdense regions in the Universe, are impacted by dark energy and massive neutrinos. In this work, relying on the DEMNUni suite of cosmological simulations, we explore the void size function in cosmologies with both dynamical dark energy and massive neutrinos. We investigate the impact of different choices of dark matter tracers on the void size function and study its sensitivity to the joint effect of modifying the dark energy equation of state and the sum of neutrino masses. We show that dark energy and massive neutrinos produce separable effects on the void size function. This statistic therefore allows us to distinguish among a wide range of combinations of dark energy equations of state and total neutrino masses, and its exploitation in forthcoming large galaxy surveys will be extremely useful in breaking degeneracies among these cosmological parameters.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Why Cosmic Voids Matter: Pristine Evolution

    astro-ph.CO 2025-09 conditional novelty 7.0 of 10

    Cosmic voids traced by halos become stable at late times, and the matter around them evolves linearly, supporting their use as clean dark-energy probes.

  2. Cosmic voids evolution in modified gravity via hydrodynamics

    astro-ph.CO 2026-02 conditional novelty 6.0 of 10

    Voids in luminal Galileon gravity are always unscreened, and a reality requirement on the fifth force rules out ~82% of the favored parameter space, yielding a redshift-dependent minimum void depth.

  3. Void spin distribution as a powerful probe of $\sigma_{8}$

    astro-ph.CO 2025-01 conditional novelty 6.0 of 10

    Void spin distributions, fitted by a generalized Gamma function, are shown in simulations to vary sensitively with sigma8 but not with Omega_cdm h^2, neutrino mass, or dark energy equation of state, offering a new deg...

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