CREMASCHINI, Claudio. Polytropic representation of non-isotropic kinetic pressure tensor for non-ideal plasma fluids in relativistic jets. PHYSICS OF FLUIDS. 2023, vol. 35, No 6, p. "067101-1"-"067101-17", 17 pp. ISSN 1070-6631. Available from: https://dx.doi.org/10.1063/5.0154814.
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Basic information
Original name Polytropic representation of non-isotropic kinetic pressure tensor for non-ideal plasma fluids in relativistic jets
Authors CREMASCHINI, Claudio (380 Italy, guarantor, belonging to the institution).
Edition PHYSICS OF FLUIDS, 2023, 1070-6631.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/23:A0000285
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1063/5.0154814
UT WoS 001000311200005
Keywords in English Anisotropy; Flow of fluids; Kinetics; Magnetic moments; Phase space methods; Tensors
Tags RIV24, UF
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 17/1/2024 09:41.
Abstract
Non-ideal fluids are likely to be affected by the occurrence of pressure anisotropy effects, whose understanding for relativistic systems requires knowledge of the energy-momentum tensor. In this paper, the case of magnetized jet plasmas at equilibrium is considered, in which both microscopic velocities of constituent particles and the continuum fluid flow are treated as relativistic ones. A theoretical framework based on covariant statistical kinetic approach is implemented, which permits the proper treatment of single-particle and phase-space kinetic constraints and, ultimately, the calculation of the system continuum fluid fields associated with physical observables. A Gaussian-like solution for the kinetic distribution function (KDF) is constructed, in which the physical mechanism responsible for the generation of temperature anisotropy is identified with magnetic moment conservation. A Chapman-Enskog representation of the same KDF is then obtained in terms of expansion around an equilibrium isotropic Juttner distribution. This permits the analytical calculation of the fluid 4-flow and stress-energy tensor and the consequent proof that the corresponding kinetic pressure tensor is non-isotropic. As a notable result, the validity of a polytropic representation for the perturbative non-isotropic pressure contributions is established, whereby directional pressures exhibit specific power-law functional dependences on fluid density.
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