Impact of a locally measured H_0 on the interpretation of cosmic chronometer data

TL;DR

This paper demonstrates that local measurements of H_0 significantly influence the interpretation of cosmic chronometer data, affecting conclusions about the universe's expansion history.

Contribution

It shows that including a locally measured H_0 can bias cosmic chronometer analyses, and clarifies the distinction between local H_0 and the background Hubble constant.

Findings

Local H_0 measurements can skew cosmic chronometer results.

Cosmic chronometers favor a steady expansion rate up to z ~ 2 when not biased by local H_0.

The apparent non-steady expansion is due to local H_0 influence.

Abstract

Whereas many measurements in cosmology depend on the use of integrated distances or time, galaxies evolving passively on a time scale much longer than their age difference allow us to determine the expansion rate H(z) solely as a function of the redshift-time derivative dz/dt. These model-independent `cosmic chronometers' can therefore be powerful discriminators for testing different cosmologies. In previous applications, the available sources strongly disfavoured models (such as LambdaCDM) predicting a variable acceleration, preferring instead a steady expansion rate over the redshift range 0 < z < 2. A more recent catalog of 30 objects appears to suggest non-steady expansion. In this paper, we show that such a result is entirely due to the inclusion of a high, locally-inferred value of the Hubble constant H_0 as an additional datum in a set of otherwise pure cosmic-chronometer measurements. This H_0, however, is not the same as the background Hubble constant if the local expansion rate is influenced by a Hubble Bubble. Used on their own, the cosmic chronometers completely reverse this conclusion, favouring instead a constant expansion rate out to z ~ 2.