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| KKLT give a mechanism to generate de Sitter vacua instring theory. And the scenario, emph{Landscape}, is suggested toexplain the problem of the cosmological constant. In this paper,adopting a simple potential describing the emph{landscape}, weinvestigate the decay of the vacuum and the evolution of theuniverse after the decay. We find that the big crunch of theuniverse is inevitable. But, according to the modified Friedmannequation, the singularity of the big crunch isavoided. Furthermore, we find that this gives a cyclic cosmologicalmodel. |
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| Keywords:theoretical physics, landscape, cyclic universe |
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