Aspects of Integrability in AdS/CFT Duality

Abstract

In this dissertation, we discuss how our understanding of the large-N spectrum of AdS/CFT has been deepened by integrability-based approaches. We begin with a comprehensive review of the integrability of the gauge theory spin-chain and that of the string sigma model. In the light of the AdS/CFT duality, they should be just two ways of describing the same underlying integrability, and it is believed that the unified integrability can be characterised by a set of Bethe ansatz equations which is valid for all values of the 't Hooft coupling. By studying the asymptotic spectrum of the AdS/CFT in the infinite spin/R-charge limit, we first identify the corresponding solitonic counterparts in the context of the AdS/CFT, which are the so-called dyonic giant magnons and the SYM magnon boundstates. Then we show that the S-matrix computed directly from the string solitons scattering precisely reproduces the prediction from the conjecture. We further perform an analyticity test by studying the singularities of the conjectured magnon boundstate S-matrix and checking the physicality conditions. These tests give strong positive supports for the integrability of large-N AdS/CFT as well as the specific form of the conjectured Bethe ansatz equations. Concerning the string theory integrability, we also provide a detailed study of certain classical string solutions on AdS_5 x S^5. These are constructed in such a way they correspond to generic soliton solutions of (Complex) sine/sinh-Gordon equations via the so-called Pohlmeyer reduction procedure. Furthermore, we describe them in terms of algebro-geometric data as finite-gap solutions, giving a complete map of the elliptic string solutions.

301 pages, Ph.D thesis (revised), v2: Minor corrections and references added

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Cited by in corpus (11)

• Quantum integrability and functional equations
• On the Rotating and Oscillating strings in $(Ad{S}_3\times S^3{)}_{\varkappa }$
• Finite-Size Effects for Multi-Magnon States
• Correlation functions of magnon and spike
• Spiky strings on AdS3 x S3 with NS-NS flux
• Review of AdS/CFT Integrability, Chapter II.1: Classical AdS5xS5 string solutions
• Correlation function of dyonic strings
• Finite size effect on the magnon's correlation functions
• Spiky strings in $\varkappa$-deformed $AdS$
• On string integrability. A journey through the two-dimensional hidden symmetries in the AdS/CFT dualities
• Semiclassical Strings in Supergravity PFT