# H_0 tension: clue to common nature of dark sector?

## TL;DR

This paper suggests that the tension in H_0 measurements indicates a unified nature of dark matter and dark energy, modeled through modified gravity, leading to intrinsic discrepancies in Hubble constant estimates.

## Contribution

It proposes a novel interpretation that the H_0 tension reflects a common origin of dark matter and dark energy within a modified gravity framework.

## Key findings

- H_0 tension is likely not due to systematic errors.
- Unified dark sector model explains the H_0 discrepancy.
- Modified gravity links cosmic acceleration with galaxy dynamics.

## Abstract

The recently sharpened H_0 tension is argued not to be a result of data calibration or other systematic but an indication for the common nature of dark matter and dark energy. This conclusion is devised within modified weak-field General Relativity where the accelerated expansion of the Universe and the dynamics of galaxy groups and clusters are described by the same parameter, the cosmological constant. The common nature of the dark sector hence will result in intrinsic discrepancy/tension between the local and global determinations of values of the Hubble constant.