Topological gravity on plumbed V-cobordisms
  An ensemble of cosmological models based on generalized BF-theory is constructed where the role of vacuum (zero-level) coupling constants is played by topologically invariant rational intersection forms (cosmological-constant matrices) of 4-dimensional plumbed V-cobordisms which are interpreted as Euclidean spacetime regions. For these regions describing topology changes, the rational and integer intersection matrices are calculated. A relation is found between the hierarchy of certain elements of these matrices and the hierarchy of coupling constants of the universal (low-energy) interactions.   PACS numbers: 0420G, 0240, 0460 
Vladimir N. Efremov, Nikolai V. Mitskievich, Alfonso M. Hernandez   Magdaleno and Ramona Serrano Bautista