Strings in Flat Space and Pp Waves from N = 4 Super Yang Mills

  title={Strings in Flat Space and Pp Waves from N = 4 Super Yang Mills},
  author={Juan Mart́ın Maldacena and Horatiu Stefan Nastase},
We explain how the string spectrum in flat space and pp-waves arises from the large N limit, at fixed g YM , of U(N) N = 4 super Yang Mills. We reproduce the spectrum by summing a subset of the planar Feynman diagrams. We give a heuristic argument for why we can neglect other diagrams. We also discuss some other aspects of pp-waves and we present a matrix model associated to the DLCQ description of the maximally supersymmetric eleven dimensional pp-waves. 

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