Stable thin-shells from 5-dimensional extremal Einstein-Yang-Mills fields

Abstract

By employing exact Einstein-Yang-Mills (EYM) solution in (4+1) dimensions we establish spherical thin-shells with mass and Yang-Mills charge. Remarkably these shells are stable against linear, radial perturbations with a barotropic fluid presented on the shell with a generic equation of state p = p(sigma) supporting the speed of sound 0 < omega(= partial derivative p/partial derivative sigma) < 1.