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  Conformal fields in the pp-wave limit

Arutyunov, G., & Sokatchev, E. (2002). Conformal fields in the pp-wave limit. Journal of High Energy Physics, 2002(8): 014.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5481-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5483-8
Genre: Journal Article

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3078.pdf (Preprint), 352KB
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 Creators:
Arutyunov, Gleb1, Author
Sokatchev, E., Author
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1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24014              

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 Abstract: The pp-wave (Penrose limit) in a conformal field theory can be viewed as a special contraction of unitary representations of a conformal group. We study kinematics of conformal fields in the contraction limit by employing a geometric approach where the effect of the contraction can be visualized as an expansion of space-time. We discuss the two common models of space-time as carrier spaces for conformal fields: one is the usual Minkowski space and the other is a coset of the conformal group over its maximal compact subgroup. We show that only the latter manifold and the corresponding conformal representation theory admit a non-singular contraction limit. We also address a question about correlation functions of conformal fields in the pp-wave limit. We argue that finiteness of the (two-point) correlators under contraction can be achieved if their dependence on the coordinates of an R-symmetry group is kept on equal footing with their space-time dependence. This is a manifestation of the fact that in the contraction limit the space-time and R-symmetry groups become indistinguishable. Our results might find applications in actual calculations of correlation functions of composite operators in the ${cal N}=4$ super Yang-Mills theory

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
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 Identifiers: eDoc: 3078
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Title: Journal of High Energy Physics
Source Genre: Journal
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Pages: - Volume / Issue: 2002 (8) Sequence Number: 014 Start / End Page: - Identifier: -