Holography and the speed of sound at high temperatures
arXiv:0905.0900 · doi:10.1103/PhysRevD.80.066002
Abstract
We show that in a general class of strongly interacting theories at high temperatures the speed of sound approaches the conformal value c_s^2=1/3 universally from_below_. This class includes theories holographically dual to a theory of gravity coupled to a single scalar field, representing the operator of the scale anomaly.
arXiv comment4 pages, corrected typos
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