NONEXTREME AND ULTRAEXTREME DOMAIN-WALLS AND THEIR GLOBAL SPACE-TIMES

Nonextreme walls (bubbles with two insides) and ultraextreme walls (bu bbles of false vacuum decay) are discussed. Their respective energy de nsities are higher and lower than that of the corresponding extreme (s upersymmetric), planar domain wall. These singularity-free space-times exhibit nontrivial causal structure analogous to certain nonextreme b lack holes. We focus on anti-de Sitter-Minkowski walls and comment on Minkowski-Minkowski walls with trivial extreme limit, as well as walls adjacent to de Sitter space-times with no extreme limit.