Universe decay and changing the cosmological constant

If superspace time is taken to be $\sqrt{\det \left(\gamma \right)}$, where ${\gamma }_{\mathrm{ij}}$ is the three-metric, then the cosmological constant plays the role of a ${\mathrm{}\left(\mathrm{mass}\right)\mathrm{}}^2$ term in the Wheeler-DeWitt equation. Second quantization allows particles of different mass to decay into one another if they are interacting. Likewise, adding interactions to the third-quantized Lagrangian allows universes with different cosmological constants to decay into one another. We consider a simple model with two types of universes, one of cosmological constant zero and the other nonzero. We compute the probability of decay and production for each type of universe.