Why do we live in 3+1 dimensions?
arXiv:hep-th/0501163 · doi:10.1016/j.physletb.2005.04.023
Abstract
In the context of string theory we argue that higher dimensional Dp-branes unwind and evaporate so that we are left with D3-branes embedded in a (9+1)-dimensional bulk. One of these D3-branes plays the role of our Universe. Within this picture, the evaporation of the higher dimensional Dp-branes provides the entropy of our Universe.
9 pages, 4 figures. Citations added, text and figures updated to match version accepted for publication