Voids in Modified Gravity Reloaded: Eulerian Void Assignment

Understand

We revisit the excursion set approach to calculate void abundances in chameleon-type modified gravity theories, which was previously studied by Clampitt, Cai and Li (2013).

• We focus on properly accounting for the void-in-cloud effect, i.e., the growth of those voids sitting in over-dense regions may be restricted by the evolution of their surroundings.
• This effect may change the distribution function of voids hence affect predictions on the differences between modified gravity and GR.
• We show that the thin-shell approximation usually used to calculate the fifth force is qualitatively good but quantitatively inaccurate.