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The problem of developing a non-perturbative formulation of string theory was one of the original motivations for studying the AdS/CFT correspondence. [37] As explained above, the correspondence provides several examples of quantum field theories that are equivalent to string theory on anti-de Sitter space.
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String theory is a theoretical framework that attempts to address these questions. The starting point for string theory is the idea that the point-like particles of particle physics can also be modeled as one-dimensional objects called strings. String theory describes how strings propagate through space and interact with each other.
[1] [2] A critical feature of the technique is a middle step that breaks the problem into "solvable" and "perturbative" parts. [3] In regular perturbation theory, the solution is expressed as a power series in a small parameter . [1] [2] The first term is the known solution to the solvable problem.
Download as PDF; Printable version; In other projects Wikimedia Commons; ... This is a list of string theory topics. String theory. Strings; Nambu–Goto action;
The S-matrix theory is related to the holographic principle and the AdS/CFT correspondence by a flat space limit. The analog of the S-matrix relations in AdS space is the boundary conformal theory. [1] The most lasting legacy of the theory is string theory. Other notable achievements are the Froissart bound, and the prediction of the pomeron.
String field theory (SFT) is a formalism in string theory in which the dynamics of relativistic strings is reformulated in the language of quantum field theory.This is accomplished at the level of perturbation theory by finding a collection of vertices for joining and splitting strings, as well as string propagators, that give a Feynman diagram-like expansion for string scattering amplitudes.
As a string travels through spacetime it traces out a surface, called the worldsheet of the string. Unfortunately, the moduli space of such parametrized surfaces, at least a priori , is infinite-dimensional; no appropriate measure on this space is known, and thus the path integrals of the theory lack a rigorous definition.