The Case for a Hubble Constant of 30 km/s/Mpc

TL;DR

The paper advocates for a Hubble constant of around 30 km/s/Mpc, arguing it offers theoretical advantages such as resolving age and structure issues in cosmology, despite current observational bounds.

Contribution

It presents a theoretical case for a lower Hubble constant, highlighting its benefits for cosmological models and consistency with observational data.

Findings

Supports a Hubble constant of ~30 km/s/Mpc for better cosmological consistency.

Shows this value resolves age crisis and aligns with galaxy cluster data.

Suggests improved agreement with nonbaryonic to baryonic mass ratios.

Abstract

Although cosmologists have been trying to determine the value of the Hubble constant for nearly 65 years, they have only succeeded in limiting the range of possibilities: most of the current observational determinations place the Hubble constant between 50 km/s/Mpc and 90 km/s/Mpc. The uncertainty is unfortunate because this fundamental parameter of cosmology determines both the distance scale and the time scale, and thereby affects almost all aspects of cosmology. Here we make the case for a Hubble constant that is even smaller than the lower bound of the accepted range, arguing on the basis of the great advantages, all theoretical in nature, of a Hubble constant of around 30 km/s/Mpc. Those advantages are: (1) a comfortable expansion age that avoids the current age crisis; (2) a cold dark matter power spectrum whose shape is in good agreement with the observational data and (3) which predicts an abundance of clusters in close agreement with that of x-ray selected galaxy clusters; (4) a nonbaryonic to baryonic mass ratio that is in better agreement with recent determinations based upon cluster x-ray studies. In short, such a value for the Hubble constant cures almost all the ills of the current theoretical orthodoxy, a flat Universe comprised predominantly of cold dark matter.