Cosmology from quantum potential in brane-anti-brane system

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Recently, some authors removed the big-bang singularity and predicted an infinite age of our universe. In this paper, we show that the same result can be obtained in string theory and M-theory; however, the shape of universe changes in different epochs. In our mechanism, first, N fundamental string decay to N D0-anti-D0-brane. Then, D0-branes join to each other, grow and and form a six-dimensional brane-antibrane system. This system is unstable, broken and present form of four dimensional universes, one anti-universe in additional to one wormhole are produced. Thus, there isn't any big-bang in cosmology and universe is a fundamental string at the beginning. Also, total age of universe contains two parts, one in related to initial age and second which is corresponded to present age of universe (ttot=tinitial+tpresent). On the other hand, initial age of universe includes two parts, the age of fundamental string and time of transition (tinitial=ttransition+tf-string). We observe that only in the case of (tf-string→ ∞), the scale factor of universe is zero and as a result, total age of universe is infinity.