Spectral sum rules for conformal field theories in arbitrary dimensions

Chowdhury, Subham Dutta and David, Justin R and Prakash, Shiroman (2017) Spectral sum rules for conformal field theories in arbitrary dimensions. In: JOURNAL OF HIGH ENERGY PHYSICS (7).

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Abstract

We derive spectral sum rules in the shear channel for conformal field theories at finite temperature in general d >= 3 dimensions. The sum rules result from the OPE of the stress tensor at high frequency as well as the hydrodynamic behaviour of the theory at low frequencies. The sum rule states that a weighted integral of the spectral density over frequencies is proportional to the energy density of the theory. We show that the proportionality constant can be written in terms the Hofman-Maldacena variables t(2); t(4) which determine the three point function of the stress tensor. For theories which admit a two derivative gravity dual this proportionality constant is given by d/2(d+1). We then use causality constraints and obtain bounds on the sum rule which are valid in any conformal field theory. Finally we demonstrate that the high frequency behaviour of the spectral function in the vector and the tensor channel are also determined by the Hofman- Maldacena variables.

Item Type:	Journal Article
Publication:	JOURNAL OF HIGH ENERGY PHYSICS
Additional Information:	Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	24 Aug 2017 06:12
Last Modified:	24 Aug 2017 06:12
URI:	http://eprints.iisc.ac.in/id/eprint/57667

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