Cylindrically symmetric radial accretion onto a Levi-Civita string-like source

TL;DR

This paper studies steady-state radial accretion of polytropic matter onto a cylindrical Levi-Civita string-like source, analyzing the influence of metric parameters and defining line mass density in a strong gravitational field.

Contribution

It introduces a cylindrical analog of Bondi accretion in Levi-Civita spacetime and discusses the role of metric parameters and line mass density in this context.

Findings

Accretion equations are insensitive to interior structure.

Analysis can focus on a simplified Wilson form of the Levi-Civita metric.

The study clarifies the physical meaning of metric parameters.

Abstract

Radial steady-state accretion of polytropic matter is investigated under cylindrical symmetry in the Levi-Civita background metric. The model can be considered as a cylindrical analog of Bondi accretion in strong gravitational field. As a byproduct of this study, the issue of defining the line mass density is addressed and the role of the metric free parameters is discussed on the example of physical observables. The form of radial accretion equations is insensitive to the structure of the interior solution. Accordingly, the accretion solution analysis can be limited to a special Wilson form of Levi-Civita metric describing a structureless homogeneous string.