Abstract
We construct the general model with only parallel positive tension 3-branes on M 4× R 1 and M 4× R 1/ Z 2. The cosmology constant is sectional constant along the fifth dimension. In this general scenario, the 5-dimensional GUT scale on each brane can be indentified as the 5-dimensional Planck scale, but, the 4-dimensional Planck scale is generated from the low 4-dimensional GUT scale exponentially in our world. We also give two simple models to show explicitly how to solve the gauge hierarchy problem.
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