Touching random surfaces, two-dimensional quantum gravity, and noncritical string theory

Oleg Andreev
1998 Physical Review D, Particles and fields  
A set of physical operators which are responsible for touching interactions in the framework of c<1 unitary conformal matter coupled to 2D quantum gravity is found. As a special case the non-critical bosonic strings are considered. Some analogies with four dimensional quantum gravity are also discussed, e.g. creation-annihilation operators for baby universes, Coleman mechanism for the cosmological constant.
doi:10.1103/physrevd.57.3725 fatcat:dz5wze4pgvedzgb4bgyf4gjngy