On the observability of coupled dark energy with cosmic voids

Abstract

Taking N-body simulations with volumes and particle densities tuned to match the SDSS DR7 spectroscopic main sample, we assess the ability of current void catalogs (e.g., Sutter et al. 2012b) to distinguish a model of coupled dark matter-dark energy from ΛCDM cosmology using properties of cosmic voids. Identifying voids with the VIDE toolkit, we find no statistically significant differences in the ellipticities, but find that coupling produces a population of significantly larger voids, possibly explaining the recent result of Tavasoli et al. (2013). In addition, we use the universal density profile of Hamaus et al. (2014) to quantify the relationship between coupling and density profile shape, finding that the coupling produces broader, shallower, undercompensated profiles for large voids by thinning the walls between adjacent medium-scale voids. We find that these differences are potentially measurable with existing void catalogs once effects from survey geometries and peculiar velocities are taken into account.

5 pages, 4 figures, moderate revision and extended discussion from referee comments, MNRAS letters accepted

References in corpus (4)

• ZOBOV: a parameter-free void-finding algorithm
• The darkness that shaped the void: dark energy and cosmic voids
• The Void Phenomenon Explained
• Detecting dark matter-dark energy coupling with the halo mass function

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• The large-scale environment from cosmological simulations I: The baryonic cosmic web
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• 1-DREAM: 1D Recovery, Extraction and Analysis of Manifolds in noisy environments
• Hidden from view: Coupled Dark Sector Physics and Small Scales
• The CIDER simulations: Nonlinear structure formation in the Constrained Interacting Dark Energy Scenario
• Gas accretion and Ram Pressure Stripping of Haloes in Void Walls
• An Optimized Ly$\alpha$ Forest Inversion Tool Based on a Quantitative Comparison of Existing Reconstruction Methods
• Cosmology with Cosmic Voids