This thesis exhibits a range of applications of combinatoric methods to string theory. The concepts and techniques used in the counting of ribbon graphs, the theory of finite groups, and the construction of cell complexes can give powerful methods and interesting insights into t…
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We explore dualities and solution-generating transformations in various contexts. Our focus is on the T-duality invariant form of supergravity known as double fi eld theory, the SL(5)-invariant M-theory extended geometry, and metrics dual under the fluid/gravity correspondence t…
In an introductory chapter, a summary of the construction of string theories is given, for both the bosonic string and the RNS superstring. Relevant mathematical technology is introduced, including super-Riemann surfaces. Conformal field theory is discussed and BRST quantization…
There has been great progress in recent years in the understanding of the mathematical structure of scattering amplitudes in Quantum Field Theory as well as the development of powerful methods for their calculation, particularly in the arena of N = 4 Super Yang-Mills where hidde…
In the past few years, on-shell analytic methods have played a pivotal role in gauge theory calculations. Since the initial success of these methods in Standard Model physics, considerable activity has led to development and application in supersymmetric gauge theories. In parti…
In this thesis we explore the finite N spectrum of BPS operators in four-dimensional supersymmetric conformal field theories (CFT), which have dual AdS gravitational descriptions. In the first part we analyze the spectrum of chiral operators in the free limit of quiver gauge the…
In this thesis the recently developed duality covariant approach to string and Mtheory is investigated. In this formalism the U-duality symmetry of M-theory or Tduality symmetry of Type II string theory becomes manifest upon extending coordinates that describe a background. The …