Galactic rotation curves and brane world models

TL;DR

This paper explores how brane-world models with extra-dimensional effects can explain galactic rotation curves without dark matter, attributing the phenomena to non-local gravitational effects like dark radiation and dark pressure.

Contribution

It demonstrates that flat galactic rotation curves can be explained solely by non-local gravitational effects in brane-world models, avoiding the need for dark matter.

Findings

Galactic rotation curves can be explained without dark matter.

Non-local effects like dark radiation and dark pressure account for observed curves.

Model aligns with established gravitational principles.

Abstract

In the present investigation flat rotational curves of the galaxies are considered under the framework of brane-world models where the 4d effective Einstein equation has extra terms which arise from the embedding of the 3-brane in the $5d$ bulk. It has been shown here that these long range bulk gravitational degrees of freedom can act as a mechanism to yield the observed galactic rotation curves without the need for dark matter. The present model has the advantage that the observed rotation curves result solely from well-established non-local effects of gravitation, such as dark radiation and dark pressure under a direct use of the condition of flat rotation curves and does not invoke any exotic matter field.