Classical strings and membranes in the AdS/CFT correspondence
Abstract
In its strongest version, the AdS/CFT conjecture states that N = 4, su(Nc) super Yang-Mills (SYM) theory is equal to type IIB string theory on AdS5xS5. It is by far the most important equation in theoretical physics of our time, a sort of a "harmonic oscillator" for both the quantum theory of gravity and gauge theories. It goes without saying that it is imperative to fully understand its limits of validity and thoroughly investigate its implications. In particular, it would be desirable to solve the theory, i.e. to be able to compute all of its observables. One of the most important observables of AdS/CFT is its spectrum. According to the AdS/CFT "dictionary", the spectrum of the theory comprises the energies of its string states, each of which must be equal to the scaling dimensions of its dual gauge theory operator. The full spectral problem of AdS/CFT is solved by integrability, in the sense that integrability provides the full set of algebraic equations that determine it. Integrabi ...
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