String Theory from Gauge Theory

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It is a challenge to derive the standard model of particle physics from string theory, which is a candidate of the unified theory of gauge and gravitational interaction. The main reason is our lack of knowledge on the non-perturbative effect of string theory. Here aiming at the understanding of the non-perturbative effect and the derivation of the standard model, we study string theory using the gauge theory description. The projects we have studied are(1) the membrane matrix model,(2) the E6 grand unified theory from string theory,(3) su(2| 2) light-cone string field theory and(4) the AdS/CFT Yangian symmetry.