Constraints on the growth of structure around cosmic voids in eBOSS DR14

TL;DR

This paper presents cosmic void catalogues from eBOSS DR14, analyzes their contamination levels, and constrains the growth rate of structure around voids using cross-correlation multipoles, with results varying between galaxy and QSO samples.

Contribution

It provides the first void catalogues from eBOSS DR14 and assesses contamination, offering new measurements of structure growth rates around cosmic voids.

Findings

LRG void catalogue is largely free from contamination.

QSO void catalogue may be heavily contaminated.

Measured growth rate parameter β at different redshifts.

Abstract

We present catalogues of cosmic voids identified in the distribution of Luminous Red Galaxies (LRGs) and Quasi Stellar Objects (QSOs) in the fourteenth data release (DR14) of the extended Baryon Oscillation Spectroscopic Survey (eBOSS). We perform a multivariate analysis to assess the level of contamination in these catalogues by spurious Poisson underdensities. We find that the LRG void catalogue is largely free from contamination but that the QSO catalogue may be heavily contaminated. We analyse the multipoles of the void-galaxy cross-correlation function in these catalogues to obtain constraints on the growth rate of structure around voids. We find a value of $\beta(z=0.703)=0.58^{+0.33}_{-0.28}$ for the LRG voids and $\beta(z=1.53)=0.15^{+0.13}_{-0.12}$ for the QSO voids.