2016/11/12 by Leila Shahsavar, Malihe Ghodrat, Afshin Montakhab
Physics and Astronomy · #Black Holes and Theoretical Physics #Classical mechanics #Cosmology and Gravitation Theories #Dissipative system #Dynamics (music) #High-Energy Particle Collisions Research #Physics #Quantum electrodynamics #Quantum mechanics #Statistical physics #cond-mat.stat-mech #physics.flu-dyn
paper · pdf · doi:10.1103/physrevc.94.064905
published as Phys. Rev. C 94, 064905 (2016) · 11 pages, 5 figures, to appear in PRC
arxiv created 2016/11/12 · openalex publication_date 2016/12/19 · arxiv updated 2016/12/23 · openalex created_date 2017/01/06 · openalex updated_date 2026/08/05
Relativistic generalization of hydrodynamic theory has attracted much attention from a theoretical point of view. However, it has many important practical applications in high energy as well as astrophysical contexts. Despite various attempts to formulate relativistic hydrodynamics, no definitive consensus has been achieved. In this work, we propose to test the predictions of four types of first-order hydrodynamic theories for nonperfect fluids in the light of numerically exact molecular dynamics simulations of a fully relativistic particle system in the low density regime. In this regard, we study the propagation of density, velocity, and heat fluctuations in a wide range of temperatures using extensive simulations and compare them to the corresponding analytic expressions we obtain for each of the proposed theories. As expected, in the low temperature classical regime all theories give the same results, consistent with the numerics. In the high temperature extremely relativistic regime, not all considered theories are distinguishable from one another. However, in the intermediate regime, a meaningful distinction exists in the predictions of various theories considered here. We find that the predictions of the recent formulation due to Tsumura, Kunihiro, and Ohnishi are more consistent with our numerical results than the traditional theories: the Meixner, modified Eckart, and modified Marle-Stewart theories.