Los puntos clave no están disponibles para este artículo en este momento.
A Euclidean lattice formulation is presented of the general fourth-order gravitational action involving R_^2 terms. This lattice theory is bounded and reflection positive. The existence of a positive Hilbert space and Hamiltonian, and hence unitarity, follow then from the standard nonperturbative Osterwalder-Schrader construction.
E. T. Tomboulis (Mon,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: