Void alignment and density profile applied to measuring cosmological parameters

Abstract

We study the orientation and density profiles of the cosmological voids with SDSS10 data. Using voids to test Alcock-Paczynski effect has been proposed and tested in both simulations and actual SDSS data. Previous observations imply that there exist an empirical stretching factor which plays an important role in the voids' orientation. Simulations indicate that this empirical stretching factor is caused by the void galaxies' peculiar velocities. Recently Hamaus et al. found that voids' density profiles are universal and their average velocities satisfy linear theory very well. In this article we first confirm that the stretching effect exists using independent analysis. We then apply the universal density profile to measure the cosmological parameters. We find that the void density profile can be a tool to measure the cosmological parameters.

8 pages, 12 figures, accepted by MNRAS

References in corpus (8)

• Universal Density Profile for Cosmic Voids
• The darkness that shaped the void: dark energy and cosmic voids
• A measurement of the Alcock-Paczynski effect using cosmic voids in the SDSS
• Alignments of Voids in the Cosmic Web
• On the universality of void density profiles
• Self-similarity and universality of void density profiles in simulation and SDSS data
• The Size, Shape and Orientation of Cosmological Voids in the Sloan Digital Sky Survey
• Void-Supercluster Alignments

Cited by in corpus (6)

• Revealing the cosmic web dependent halo bias
• Updated void catalogs of the SDSS DR7 main sample
• DEMNUni: The imprint of massive neutrinos on the cross-correlation between cosmic voids and CMB lensing
• Evolution of density and velocity profiles of dark matter and dark energy in spherical voids
• Voids in the Cosmic Web as a probe of dark energy
• An Anti-halo Void Catalogue of the Local Super-Volume