Cosmology and galactic rotation curves

TL;DR

This paper proposes that galactic rotation curve anomalies can be explained by a cosmological effect within conformal gravity, eliminating the need for dark matter and suggesting an open universe with specific curvature.

Contribution

It introduces a conformal gravity framework that accounts for galactic rotation curves through a cosmological linear potential, challenging dark matter hypotheses.

Findings

Conformal gravity explains rotation curves without dark matter.

The universe is predicted to be open with a specific scalar curvature.

Local Hubble flow appears as a universal linear potential.

Abstract

We explore the possibility that the entire departure of galactic rotational velocities from their luminous Newtonian expectation be cosmological in origin, and show that within the framework of conformal gravity (but not Einstein gravity apparently) every static observer sees the overall Hubble flow as a local universal linear potential which is able to account for available data without any need for dark matter. We find that the Universe is necessarily an open one with 3-space scalar curvature given by $k = -3.5\times 10^{-60}$cm$^{-2}$.