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Cosmic voids, the underdense regions in the Universe, are impacted by darkenergy and massive neutrinos. In this work, relying on the DEMNUni suite ofcosmological simulations, we explore the void size function in cosmologies withboth dynamical dark energy and massive neutrinos. We investigate the impact ofdifferent choices of dark matter tracers on the void size function and studyits sensitivity to the joint effect of modifying the dark energy equation ofstate and the sum of neutrino masses. We show that dark energy and massiveneutrinos produce separable effects on the void size function. This statistictherefore allows us to distinguish among a wide range of combinations of darkenergy equations of state and total neutrino masses, and its exploitation inforthcoming large galaxy surveys will be extremely useful in breakingdegeneracies among these cosmological parameters.

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