String theory explanation of galactic rotation

TL;DR

This paper presents a string theory-based explanation for galactic rotation curves using a specific spherically symmetric metric that solves modified field equations, offering a potential alternative to dark matter.

Contribution

It introduces a unique metric with specific properties that models galactic rotation and demonstrates its solution status within string theory and scalar-tensor frameworks.

Findings

The metric has vanishing Weyl tensor and asymptotically de Sitter behavior.

It is an exact solution in scalar-tensor and string theory models.

Provides a theoretical basis for galactic rotation without dark matter.

Abstract

The unique spherically symmetric metric which has vanishing weyl tensor, is asymptotically desitter, and can model constant galactic rotation curves is presented. Two types of field equations are shown to have this metric as an exact solution. The first is palatini varied scalar-tensor theory. The second is the low energy limit of string theory modified by inclusion of a contrived potential.