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Title: Wave speeds in the macroscopic extended model for ultrarelativistic gases

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.
Authors:
 [1] ;  [2] ;  [3]
  1. Dip. Matematica e Informatica, Università di Cagliari, Via Ospedale 72, 09124 Cagliari (Italy)
  2. Dip. Matematica, Università di Cagliari, Viale Merello 92, 09123 Cagliari (Italy)
  3. Dip. Matematica, Università di Cagliari, Via Ospedale 72, 09124 Cagliari (Italy)
Publication Date:
OSTI Identifier:
22251470
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Mathematical Physics; Journal Volume: 54; Journal Issue: 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EQUATIONS; GASES; RELATIVISTIC RANGE; SCALARS; TENSORS; THERMODYNAMICS; VELOCITY