Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-09-17
Phys.Lett. B503 (2001) 163-172
Physics
High Energy Physics
High Energy Physics - Theory
Latex, 15 pages, version to appear in PLB
Scientific paper
10.1016/S0370-2693(01)00215-5
We discuss the general models with one time-like extra dimension and parallel 3-branes on the space-time $M^4 \times M^1$. 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 $M^4\times (M^1)^{n+m}$, 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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