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

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/ρ^α} $. 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.