Progress in string theory has resulted in a whole landscape of vacua solutions.In this talk I explore the cosmological implications of the landscape, based on the dynamics of the wavefunction of the universe propagating on it. The landscape is taken as the phase space of the initial conditions since every of its vacua can potentially give rise to a universe. A superselection rule on the landscape phase space emerges when we include the backreaction of massive long wavelengths and the quantum dynamics of gravitational and matter degrees of freedom. This rule selects only high energy patches which survive the collapse induced by the gravitational instability of massive perturbations.
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Laura Mersini–Houghton (2006) studied this question.