Living Near de Sitter Bubble Walls

摘要: We study various bubble solutions in string/M theories obtained by double Wick rotations of (non-)extremal brane configurations. Typically, the geometry interpolates de Sitter space-time times non-compact extra-dimensional space near-bubble wall region and asymptotic flat Minkowski space-time. These provide nice background geometries reconciling with For application these to cosmology, we consider multi-bubble find landscapes varying cosmological constant. Double rotation theories, used this paper, introduces imaginary higher-form fields. Rather than regard fields as classical pathologies, interpret them semi-classical decay processes vacuum via production spherical branes. speculate on possibility solving constant problem making use condensation membranes.