Real-time gauge/gravity duality

We present a general prescription for the holographic computation of real-time n-point functions in nontrivial states. In quantum field theory such real-time computations involve a choice of a time contour in the complex time plane. The holographic prescription amounts to "filling in" this...

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Bibliographic Details
Published in:Physical review letters 2008-08, Vol.101 (8), p.081601-081601, Article 081601
Main Authors: Skenderis, Kostas, van Rees, Balt C
Format: Article
Language:English
Subjects:
CALCULATION METHODS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DUALITY
FUNCTIONS
GRAVITATION
HOLOGRAPHY
MATHEMATICAL SOLUTIONS
QUANTUM FIELD THEORY
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Summary:We present a general prescription for the holographic computation of real-time n-point functions in nontrivial states. In quantum field theory such real-time computations involve a choice of a time contour in the complex time plane. The holographic prescription amounts to "filling in" this contour with bulk solutions: real segments of the contour are filled in with Lorentzian solutions while imaginary segments are filled in with Riemannian solutions and appropriate matching conditions are imposed at the corners of the contour. We illustrate the general discussion by computing the 2-point function of a scalar operator using this prescription and by showing that this leads to an unambiguous answer with the correct iE insertions.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.081601