INTERACTION HIERARCHY: STRING AND QUANTUM GRAVITY
George K. Savvidy, Konstantin G. Savvidy · Modern Physics Letters A · 1996
We have found that the functional integral for quantum gravity can be represented as a superposition of less complicated theory of random surfaces with Euler character as an action. We propose an alternative linear action A(M4) for quantum gravity. On the lattice we constructed spin system with local interaction, which has the equivalent partition function. The scaling limit is discussed.