Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-02-26
Prog.Theor.Phys.Suppl.134:182-206,1999
Physics
High Energy Physics
High Energy Physics - Theory
Expanded and combined version of two talks given at Nishinomiya-Yukawa Symposium, Nov., 1998 and YITP workshop, Nov., 1998, 23
Scientific paper
10.1143/PTPS.134.182
The recent developments towards the possible non-perturbative formulation of string/M theory using supersymmetric Yang-Mills matrix models (SYMs) are discussed. In the first part, we give a critical review on the status of our present understanding, focusing on the connection of the D0-brane matrix models to supergravity and its relevance to the so-called Matrix-theory conjecture. We also discuss some problems concerning the conjectured relation between supergravity in AdS background and SYM from the viewpoint of D-brane interactions. We present a qualitative argument showing how the boundary condition at AdS boundary dictates the correlators on the large N system of source D-branes. Then, in the final part, we turn to the question how to formulate the condensation of graviton in matrix models, taking the simplest example of type IIB matrix model. We argue the emergence of a hidden symmetry GL(10, R), beyond the manifest Lorentz symmetry SO(9,1), by embedding U(N) model into models with higher N and by treating the whole recursive series of models simultaneously. This suggests a possible approach toward background independent formulations of matrix models.
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