Measuring H0 from the 6dF Galaxy Survey and future low-redshift surveys

TL;DR

This paper discusses how low-redshift baryon acoustic oscillation measurements from surveys like 6dF, WALLABY, and TAIPAN can precisely determine the Hubble constant, H0, with minimal model dependence.

Contribution

It presents current BAO-based H0 measurement from 6dF and forecasts improved precision from upcoming surveys WALLABY and TAIPAN.

Findings

6dF measures H0 as 67 +/- 3.2 km/s/Mpc

Upcoming surveys could achieve 1-3% H0 precision

BAO provides a largely model-independent H0 estimate

Abstract

Baryon acoustic oscillations (BAO) at low redshift provide a precise and largely model-independent way to measure the Hubble constant, H0. The 6dF Galaxy Survey measurement of the BAO scale gives a value of H0 = 67 +/- 3.2 km/s/Mpc, achieving a 1-sigma precision of 5%. With improved analysis techniques, the planned WALLABY (HI) and TAIPAN (optical) redshift surveys are predicted to measure H0 to 1-3% precision.