Spectral sum rules for conformal field theories in arbitrary dimensions

Chowdhury, Subham Dutta ; David, Justin R. ; Prakash, Shiroman (2017) Spectral sum rules for conformal field theories in arbitrary dimensions Journal of High Energy Physics, 2017 (7). ISSN 1029-8479

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Official URL: http://doi.org/10.1007/JHEP07(2017)119

Related URL: http://dx.doi.org/10.1007/JHEP07(2017)119


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 d2(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:Article
Source:Copyright of this article belongs to Springer Nature Switzerland AG.
Keywords:Ads-cft Correspondence; Conformal and W Symmetry; Higher Spin Gravity; Higher Spin Symmetry.
ID Code:116999
Deposited On:14 Apr 2021 08:16
Last Modified:14 Apr 2021 08:16

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