A nearly cylindrically symmetric source in the Brans-Dicke gravity as the generator of the rotational curves of the galaxies

TL;DR

This paper proposes a nearly cylindrically symmetric solution within Brans-Dicke gravity to explain the observed flat rotation curves of galaxies, addressing a longstanding astrophysical puzzle.

Contribution

It introduces a novel cylindrical symmetric model in Brans-Dicke gravity as a potential explanation for galaxy rotation curves.

Findings

Model reproduces the observed velocity increase in galaxies

Provides an alternative to dark matter explanations

Suggests scalar-tensor theories can account for galactic dynamics

Abstract

Observation shows that the velocities of stars grow by approximately 2 to 3 orders of magnitude when the distances from the centers of the galaxies are in the range of $0.5$ kpc to $82.3$ kpc, before they begin to tend to a constant value. Up to know, the reason for this behavior is still a matter for debate. In this work, we propose a model which adequately describes this unusual behavior using a (nearly) cylindrical symmetrical solution in the framework of a scalar-tensor-like (the Brans-Dicke model) theory of gravity.