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A variational approach to resistive general relativistic two-temperature plasmas

A variational approach to resistive general relativistic two-temperature plasmas
A variational approach to resistive general relativistic two-temperature plasmas

We develop an action principle to construct the field equations for dissipative/resistive general relativistic two-temperature plasmas, including a neutrally charged component. The total action is a combination of four pieces: an action for a multifluid/plasma system with dissipation/resistivity and entrainment; the Maxwell action for the electromagnetic field; the Coulomb action with a minimal coupling of the four-potential to the charged fluxes; and the Einstein–Hilbert action for gravity (with the metric being minimally coupled to the other action pieces). We use a pull-back formalism from spacetime to abstract matter spaces to build unconstrained variations for the neutral, positively, and negatively charged fluid species and for three associated entropy flows. The full suite of field equations is recast in the so-called “ (Formula presented.) ” form (suitable for numerical simulations), where spacetime is broken up into a foliation of spacelike hypersurfaces and a prescribed “flow-of-time”. A previously constructed phenomenological model for the resistivity is updated to include the modified heat flow and the presence of a neutrally charged species. We impose baryon number and charge conservation as well as the Second Law of Thermodynamics in order to constrain the number of free parameters in the resistivity. Finally, we take the Newtonian limit of the “ (Formula presented.) ” form of the field equations, which can be compared to existing non-relativistic formulations. Applications include main sequence stars, neutron star interiors, accretion disks, and the early universe.

plasmas, relativistic fluid dynamics
2218-1997
Comer, Gregory Lee
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Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Celora, Thomas
b15e9792-aae0-479a-83c5-b5c874b19fa6
Hawke, Ian
fc964672-c794-4260-a972-eaf818e7c9f4
Comer, Gregory Lee
0ee3a15e-e5c6-43f8-9903-d76faa820bd9
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Celora, Thomas
b15e9792-aae0-479a-83c5-b5c874b19fa6
Hawke, Ian
fc964672-c794-4260-a972-eaf818e7c9f4

Comer, Gregory Lee, Andersson, Nils, Celora, Thomas and Hawke, Ian (2023) A variational approach to resistive general relativistic two-temperature plasmas. Universe, 9 (6), [282]. (doi:10.3390/universe9060282).

Record type: Article

Abstract

We develop an action principle to construct the field equations for dissipative/resistive general relativistic two-temperature plasmas, including a neutrally charged component. The total action is a combination of four pieces: an action for a multifluid/plasma system with dissipation/resistivity and entrainment; the Maxwell action for the electromagnetic field; the Coulomb action with a minimal coupling of the four-potential to the charged fluxes; and the Einstein–Hilbert action for gravity (with the metric being minimally coupled to the other action pieces). We use a pull-back formalism from spacetime to abstract matter spaces to build unconstrained variations for the neutral, positively, and negatively charged fluid species and for three associated entropy flows. The full suite of field equations is recast in the so-called “ (Formula presented.) ” form (suitable for numerical simulations), where spacetime is broken up into a foliation of spacelike hypersurfaces and a prescribed “flow-of-time”. A previously constructed phenomenological model for the resistivity is updated to include the modified heat flow and the presence of a neutrally charged species. We impose baryon number and charge conservation as well as the Second Law of Thermodynamics in order to constrain the number of free parameters in the resistivity. Finally, we take the Newtonian limit of the “ (Formula presented.) ” form of the field equations, which can be compared to existing non-relativistic formulations. Applications include main sequence stars, neutron star interiors, accretion disks, and the early universe.

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Accepted/In Press date: 5 June 2023
Published date: 9 June 2023
Additional Information: Funding Information: NA and IH gratefully acknowledge support from Science and Technology Facility Council (STFC) via grant numbers ST/R00045X/1 and ST/V000551/1.
Keywords: plasmas, relativistic fluid dynamics

Identifiers

Local EPrints ID: 482007
URI: http://eprints.soton.ac.uk/id/eprint/482007
ISSN: 2218-1997
PURE UUID: 53dc84dd-e859-449f-a7aa-941fb24b9706
ORCID for Nils Andersson: ORCID iD orcid.org/0000-0001-8550-3843
ORCID for Thomas Celora: ORCID iD orcid.org/0000-0002-6515-3644
ORCID for Ian Hawke: ORCID iD orcid.org/0000-0003-4805-0309

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Date deposited: 15 Sep 2023 16:32
Last modified: 06 Jun 2024 01:43

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Contributors

Author: Gregory Lee Comer
Author: Nils Andersson ORCID iD
Author: Thomas Celora ORCID iD
Author: Ian Hawke ORCID iD

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