  By assuming that only (i) bilocal vertex operators which are diagonal with
respect to the basis for local field operators, and (ii) the convergent
elements with nonzero positive energy of the density matrix representing the
quantum state of multiply-connected wormholes, contribute the path integral
that describes the effects of wormholes on ordinary matter fields at low
energy, it is obtained that the probability measure for multiply connected
wormholes with nondegenerate energy spectrum is given in terms of a Planckian
probability distribution for the momenta of a quantum field $\frac{1}{2}\alpha^
{2}$, where the $\alpha$'s are the Coleman parameters, rather than a classical
gaussian distribution law, and that an observable classical universe can exist
if, and only if, such multiply connected wormholes are allowed to occur.

General Relativity and Quantum Cosmology