An improved model of redshift-space distortions around voids: application to quintessence dark energy

Abstract

Using cosmic voids to probe the growth rate of cosmic structure, and hence the nature of dark energy, is particularly interesting in the context of modified gravity theories that rely on the screening mechanism. In this work we improve the modelling of redshift-space distortions around voids in the dark matter density field, and thus reduce systematic errors in the derivation of cosmological parameters. We also show how specific types of voids can be used to better probe the growth rate, using a flexible void finder. We apply our results to test for a quintessence type of dark energy vs. a LCDM model, and find a good agreement with the fiducial cosmology after implementing an analytical correction to the radial velocity profiles around voids. We additionally outline characteristic imprints of dark energy in the dark matter velocity distributions around voids.

12 pages, 11 figures

References in corpus (8)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• ZOBOV: a parameter-free void-finding algorithm
• A measurement of the Alcock-Paczynski effect using cosmic voids in the SDSS
• A Map of the Integrated Sachs-Wolfe Signal from Luminous Red Galaxies
• Voids of dark energy
• Imprint of DES super-structures on the Cosmic Microwave Background
• Testing the imprint of non-standard cosmologies on void profiles using Monte Carlo random walks

Cited by in corpus (2)

• Non-fiducial cosmological test from geometrical and dynamical distortions around voids
• Reconstructing matter profiles of spherically compensated cosmic regions in $\Lambda$CDM cosmology