The silence of the little strings
The silence of the little strings
We study the hydrodynamics of the high-energy phase of Little String Theory. The poles of the retarded two-point function of the stress energy tensor contain information about the speed of sound and the kinetic coefficients, such as shear and bulk viscosity. We compute this two-point function in the dual string theory and analytically continue it to lorentzian signature. We perform an independent check of our results by the lorentzian supergravity calculation in the background of non-extremal NS5-branes. The speed of sound vanishes at the Hagedorn temperature. The ratio of shear viscosity to entropy density is equal to the universal value 1/4? and does not receive ?' corrections. The ratio of bulk viscosity to entropy density equals 1/10?. We also compute the R-charge diffusion constant. In addition to the hydrodynamic singularities, the correlators have an infinite series of finite-gap poles, and a massless pole with zero attenuation.
conformal field models in string theory, AdS-CFT and dS-CFT correspondence
1-24
Parnachev, Andrei
34538d2c-1f6d-464c-a28d-43e63b61db26
Starinets, Andrei
e482307a-5f18-4ce5-baa5-af92ffffec14
10 October 2005
Parnachev, Andrei
34538d2c-1f6d-464c-a28d-43e63b61db26
Starinets, Andrei
e482307a-5f18-4ce5-baa5-af92ffffec14
Abstract
We study the hydrodynamics of the high-energy phase of Little String Theory. The poles of the retarded two-point function of the stress energy tensor contain information about the speed of sound and the kinetic coefficients, such as shear and bulk viscosity. We compute this two-point function in the dual string theory and analytically continue it to lorentzian signature. We perform an independent check of our results by the lorentzian supergravity calculation in the background of non-extremal NS5-branes. The speed of sound vanishes at the Hagedorn temperature. The ratio of shear viscosity to entropy density is equal to the universal value 1/4? and does not receive ?' corrections. The ratio of bulk viscosity to entropy density equals 1/10?. We also compute the R-charge diffusion constant. In addition to the hydrodynamic singularities, the correlators have an infinite series of finite-gap poles, and a massless pole with zero attenuation.
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Published date: 10 October 2005
Keywords:
conformal field models in string theory, AdS-CFT and dS-CFT correspondence
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Local EPrints ID: 57531
URI: http://eprints.soton.ac.uk/id/eprint/57531
PURE UUID: 75f9d2d9-2e9f-40d3-b9c9-5e56e928b65b
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Date deposited: 14 Aug 2008
Last modified: 15 Mar 2024 11:07
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Author:
Andrei Parnachev
Author:
Andrei Starinets
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