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Abstract:

Within the framework of relativistic fluctuating hydrodynamics we compute the contribution of thermal fluctuations to the effective infrared shear viscosity of a conformal fluid, focusing on quadratic (in fluctuations), second order (in velocity gradients) terms in the conservation equations. Our approach is based on the separation of hydrodynamic fields in soft and ultrasoft sectors, in which the effective shear viscosity arises due to the action of the soft modes on the evolution of the ultrasoft ones. We find that for a strongly coupled fluid with small shear viscosity-to-entropy ratio η/s the contribution of thermal fluctuations to the effective shear viscosity is small but significant. Using realistic estimates for the strongly coupled quark-gluon plasma created in heavy ion collisions, we find that for η/s close to the AdS/CFT lower bound 1/(4π) the correction is positive and at most amounts to 10% in the temperature range 200-300MeV, whereas for larger values η/s ∼ 2/(4π) the correction is negligible. For weakly coupled theories the correction is very small even for η/s = 0.08 and can be neglected. © SISSA 2012.

Registro:

Documento: Artículo
Título:Shear viscosity from thermal fluctuations in relativistic conformal fluid dynamics
Autor:Peralta-Ramos, J.; Calzetta, E.
Filiación:Instituto de Física Teórica, Universidade Estadual Paulista, Rua Doutor Bento Teobaldo Ferraz 271, Bloco II, 01140-070 São Paulo, Brazil
Departamento de Física, FCEyN-UBA, Ciudad Universitaria, Pabellón I, Buenos Aires 1428, Argentina
Palabras clave:Phenomenological models; Quantum dissipative systems
Año:2012
Volumen:2012
Número:2
DOI: http://dx.doi.org/10.1007/JHEP02(2012)085
Título revista:Journal of High Energy Physics
Título revista abreviado:J. High Energy Phys.
ISSN:11266708
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2012_n2_p_PeraltaRamos

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Citas:

---------- APA ----------
Peralta-Ramos, J. & Calzetta, E. (2012) . Shear viscosity from thermal fluctuations in relativistic conformal fluid dynamics. Journal of High Energy Physics, 2012(2).
http://dx.doi.org/10.1007/JHEP02(2012)085
---------- CHICAGO ----------
Peralta-Ramos, J., Calzetta, E. "Shear viscosity from thermal fluctuations in relativistic conformal fluid dynamics" . Journal of High Energy Physics 2012, no. 2 (2012).
http://dx.doi.org/10.1007/JHEP02(2012)085
---------- MLA ----------
Peralta-Ramos, J., Calzetta, E. "Shear viscosity from thermal fluctuations in relativistic conformal fluid dynamics" . Journal of High Energy Physics, vol. 2012, no. 2, 2012.
http://dx.doi.org/10.1007/JHEP02(2012)085
---------- VANCOUVER ----------
Peralta-Ramos, J., Calzetta, E. Shear viscosity from thermal fluctuations in relativistic conformal fluid dynamics. J. High Energy Phys. 2012;2012(2).
http://dx.doi.org/10.1007/JHEP02(2012)085