A1 Journal article (refereed)
Diffusion processes involving multiple conserved charges : a study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions (2020)

Fotakis, J. A., Greif, M., Greiner, C., Denicol, G. S., & Niemi, H. (2020). Diffusion processes involving multiple conserved charges : a study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions. Physical Review D, 101(7), Article 076007. https://doi.org/10.1103/PhysRevD.101.076007

JYU authors or editors

Publication details

All authors or editors: Fotakis, Jan A.; Greif, Moritz; Greiner, Carsten; Denicol, Gabriel S.; Niemi, Harri

Journal or series: Physical Review D

ISSN: 2470-0010

eISSN: 2470-0029

Publication year: 2020

Volume: 101

Issue number: 7

Article number: 076007

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.101.076007

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/68551

Web address of parallel published publication (pre-print): https://arxiv.org/abs/1912.09103

Abstract

The bulk nuclear matter produced in heavy ion collisions carries a multitude of conserved quantum numbers: electric charge, baryon number, and strangeness. Therefore, the diffusion processes associated with these conserved charges cannot occur independently and must be described in terms of a set of coupled diffusion equations. This physics is implemented by replacing the traditional diffusion coefficients for each conserved charge by a diffusion coefficient matrix, which quantifies the coupling between the conserved quantum numbers. The diagonal coefficients of this matrix are the usual charge diffusion coefficients, while the off-diagonal entries describe the diffusive coupling of the charge currents. In this paper, we show how to calculate this diffusion coefficient matrix from kinetic theory and provide results for a hadron resonance gas and a gas of partons. We further find that the off-diagonal entries can reach similar magnitudes compared to the diagonal entries. In order to provide some insight on the influence that the coupling between the net charge diffusion currents can have on heavy ion observables, we present first results for the diffusive evolution of a hadronic system in a simple (1+1)D-fluid dynamics approach, and study different configurations of the diffusion matrix.

Keywords: particle physics; nuclear physics; diffusion (physical phenomena)

Free keywords: diffusion; relativistic heavy-ion collisions; transport phenomena

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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2