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# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Coupling dependence of jet quenching in hot strongly-coupled gauge theories

16 Aug 2012, 14:40
20m
Empire ()

### Empire

Oral Presentation

### Speaker

Peter Arnold (University of Virginia)

### Description

Previous top-down studies of jet stopping in strongly-coupled QCD-like plasmas with gravity duals have been in the infinite 't Hooft coupling limit $\lambda \to \infty$. They have found that, though a wide range of jet stopping distances are possible depending on initial conditions, the maximum jet stopping distance $\ell_{\rm max}$ scales with energy as $E^{1/3}$ at large energy. But it has always been unclear whether the large-coupling and high-energy limits commute. We use the string $\alpha'$ expansion in AdS-CFT to study the corrections to the $\lambda{=}\infty$ result in powers of $1/\lambda$ by assessing the effects of all higher-derivative corrections to the supergravity action for the gravity dual. We find that sometimes $\lambda=\infty$ results can be trusted for jet stopping, but other times the expansion in $1/\lambda$ breaks down.

### Primary authors

Prof. Diana Vaman (University of Virginia) Peter Arnold (University of Virginia)

 Slides