Is non-particle dark matter equation of state parameter evolving with time?

TL;DR

This paper explores whether a dynamic equation of state parameter for non-particle dark matter can resolve the Hubble tension while remaining consistent with galactic rotation curves, suggesting evolving dark matter properties.

Contribution

It introduces the idea that a dynamic dark matter equation of state parameter can reconcile cosmological and galactic observations, extending previous static models.

Findings

Static $\\omega \approx -0.01$ conflicts with galactic rotation curves.

A dynamic $\omega$ can resolve Hubble tension without affecting rotation curves.

Evolving dark matter properties may unify cosmological and galactic data.

Abstract

Recently, the so-called Hubble Tension, i.e. the mismatch between the local and the cosmological measurements of the Hubble parameter, has been resolved when non-particle dark matter is considered which has a negative equation of state parameter ($\omega \approx -0.01$). We investigate if such a candidate can successfully describe the galactic flat rotation curves. It is found that the flat rotation curve feature puts a stringent constraint on the dark matter equation of state parameter $\omega$ and $\omega \approx -0.01$ is not consistent with flat rotational curves, observed around the galaxies. However, a dynamic $\omega$ of non-particle dark matter may overcome the Hubble tension without affecting the flat rotation curve feature.