Abstract
We discuss the general models with one time-like extra dimension and parallel 3-branes on the space–time M 4× M 1. We also construct the general brane models or networks with n space-like and m time-like extra dimensions and with constant bulk cosmological constant on the space–time M 4×( M 1) n+ m , and point out that there exist two kinds of models with zero bulk cosmological constant: for static solutions, we have to introduce time-like and space-like extra dimensions, and for non-static solutions, we can obtain the models with only space-like extra dimension(s). In addition, we give two simplest models explicitly, and comment on the 4-dimensional effective cosmological constant.
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