Domain wall network evolution in (N+1)-dimensional FRW universes
  We develop a velocity-dependent one-scale model for the evolution of domain wall networks in flat expanding or collapsing homogeneous and isotropic universes with an arbitrary number of spatial dimensions, finding the corresponding scaling laws in frictionless and friction dominated regimes. We also determine the allowed range of values of the curvature parameter and the expansion exponent for which a linear scaling solution is possible in the frictionless regime. 
P.P. Avelino, L. Sousa
hep-th astro-ph.CO gr-qc hep-ph