Cosmic balloons

B. Holdom
1994 Physical Review D, Particles and fields  
Cosmic balloons, consisting of relativistic particles trapped inside a spherical domain wall, may be created in the early universe. We calculate the balloon mass M as a function of the radius R and the energy density profile, ρ (r), including the effects of gravity. At the maximum balloon mass 2GM/R≈ 0.52 for any value of the mass density of the wall.
doi:10.1103/physrevd.49.3844 pmid:10017387 fatcat:e66slkfnhjbsdokuk4tdqm5xbm