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It is shown that a simple model for 4-dimensional quantum gravity based on a3-dimensional generalization of anyon superconductivity can be regarded as adiscrete form of Polyakov's string theory. This suggests that there is auniversal negative pressure that is on the order of the string tension dividedby the square of the Robertson-Walker scale factor. This is in accord withrecent observations of the brightness of distant supernovae, which suggest thatat the present time there is a vacuum energy whose magnitude is close to themass density of an Einstein-de Sitter universe.Comment: Postscript, 10 page

ON THE OCCURRENCE OF A POSITIVE VACUUM ENERGY IN A QUANTUM MODEL FOR SPACE–TIME