Wave speeds in the macroscopic extended model for ultrarelativistic gases

被引:2
|
作者
Borghero, F. [1 ]
Demontis, F. [2 ]
Pennisi, S. [3 ]
机构
[1] Univ Cagliari, Dip Matemat & Informat, I-09124 Cagliari, Italy
[2] Univ Cagliari, Dip Matemat, I-09123 Cagliari, Italy
[3] Univ Cagliari, Dip Matemat, I-09124 Cagliari, Italy
关键词
MOMENT EQUATIONS; THERMODYNAMICS; PROPAGATION; VELOCITY; SYSTEMS; LAWS;
D O I
10.1063/1.4829365
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Equations determining wave speeds for a model of ultrarelativistic gases are investigated. This model is already present in literature; it deals with an arbitrary number of moments and it was proposed in the context of exact macroscopic approaches in Extended Thermodynamics. We find these results: the whole system for the determination of the wave speeds can be divided into independent subsystems which are expressed by linear combinations, through scalar coefficients, of tensors all of the same order; some wave speeds, but not all of them, are expressed by square roots of rational numbers; finally, we prove that these wave speeds for the macroscopic model are the same of those furnished by the kinetic model. (C) 2013 AIP Publishing LLC.
引用
收藏
页数:15
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