I just heard that the cosmological constant is a coupling constant in some perturbative expansion of some QFT and can be interpreted as a mass? Is this true? Wouldn't that be interesting? That would mean that the GR effect of expansion may be responsible (or may be an equivalent expression for) QFT, right? Where can I learn more about this? If this is correct, then there is now two ways to look at mass - as the coupling constant in QFT and as the mass matrix that is the metric that transforms between configuration space and phase space (Frankel's The Geometry of Physics, page 55). Since the coupling constant is solved for using the integrals of a perturbation expansion, is it possible to equate the coupling constant, which is a mass, to the metric, or its determinate, and equate this to the integral of the perturbation expansion, which also involves the metric in the integrand. Wouldn't this turn the metric into a dynamical entity to be solved for in the process? Or has this already been attempted? Or would this give us not enough equations to solve for the number of unknowns? Thanks.