Strings as a Model for Parent and Baby Universes: Total Splitting Rates
Abstract
Emission of hard microscopic string (graviton) by an excited macroscopic string may be viewed as a model of branching of a (1+1)-dimensional baby universe off large parent one. We show that, apart from a trivial factor, the total emission rate is not suppressed by the size of the macroscopic string. This implies unsuppressed loss of quantum coherence in (1+1)-dimensional parent universe.
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