Spherically symmeteric dark energy structure in the context of Chaplygin gas model

TL;DR

This paper explores spherically symmetric dark energy structures within the generalized Chaplygin gas model, including a modified version with matter, and compares theoretical results with observational data from low-surface-brightness galaxies.

Contribution

It introduces a modified GCG model with matter term and analyzes its implications for dark energy structures, comparing with galaxy observations.

Findings

Modified GCG model fits observational data better

Dark energy structures can mimic dark matter effects

Potential for explaining galaxy rotation curves

Abstract

Spherically symmetric dark energy structures are investigated in the framework of a generalized Chaplygin gas (GCG), which has an equation of state of the form $P = - A/\rho^{\alpha}} $. We also study these in a modified GCG equation of state, which includes a matter term, i.e. $P = \sigma^{2} \rho - A/\rho^{\alpha}$. The results of the latter are then compared with some observational data on low-surface-brightness galaxies which are supposed to be dominated by dark matter.