Principle of Diminishing Potentialities in Large N Algebras

Abstract

A connection between the completion of quantum mechanics featuring events and the theory of emergent spacetime in quantum gravity where von Neumann algebra plays a vital role is established. In thermal equilibrium, it can be shown that the Principle of Diminishing Potentialities (PDP) holds for the large $N$ algebra of $\mathcal{N}=4$ Super Yang-Mills (SYM) theory with gauge group $SU(N)$ when the temperature is higher than Hawking-Page temperature. Below Hawking-Page transition and for the case of zero temperature, PDP does not hold. Since the centralizer of thermofield double state on the large $N$ algebra of $\mathcal{N}=4$ SYM theory coincides with the center of the large $N$ algebra which is trivial, we extend the large $N$ algebra by performing crossed product by the maximal abelian subgroup $H $ of the compact symmetry group $G$ of the two-sided eternal black hole. In this case, the centralizer of an extension of thermofield double state is non-trivial and it is given by the action of the maximal abelian subgroup $H$ on the Hilbert space $\mathcal{H}_{TFD} \otimes L^{2} (H)$. This centralizer is by itself commutative and it coincides with its own center. This implies that the first actual event that initiate the ``Events-Trees-Histories'' dynamical evolution in this framework is given by the spectral projectors associated to the action of the Cartan subalgebra $\mathfrak{h}$ of the Lie algebra $\mathfrak{g}$ associated to the group $G$ on the Hilbert space $\mathcal{H}_{TFD} \otimes L^{2} (H)$.