Relativistic bulk viscosity in the relaxation time approximation: a chaotic velocities approach

10th Mexican School on Gravitation and Mathematical Physics: "Reaching a Century: Classical and Modified General Relativity's Attempts to explain de evolution of the Universe"'

物理学;数学

García-Perciante, A.L.^1 ; Méndez, A.R.^1 ; Sandoval-Villalbazo, A.^2

Depto. de Matemáticas Aplicadas y Sistemas, Universidad Autónoma Metropolitana-Cuajimalpa, Prol. Vasco de Quiroga 4871, México D.F

05348, Mexico^1

Depto. de Física y Matemáticas, Universidad Iberoamericana, Prolongación Paseo de la Reforma 880, México D. F.

01219, Mexico^2

关键词: Bulk viscosity;    Chapman-Enskog methods;    Dilute gas;    High temperature;    Relaxation parameter;    Relaxation time approximation;    Stress tensors;    Transport coefficient;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/654/1/012004/pdf
DOI  :  10.1088/1742-6596/654/1/012004

来源: IOP

【 摘 要 】

In this short note, the bulk viscosity for a high temperature dilute gas is calculated by applying the Chapman-Enskog method within Marle's relaxation time approximation. The expression for the stress-tensor established in Ref.[1], using explicitly the concept of chaotic velocity, is used in order to obtain the transport coefficient. The result is compared with previous expressions obtained by other authors using similar methods and emphasis is made on the agreement when a corrected relaxation parameter is considered.