Detailed Information on Publication Record
2020
Charged fluids encircling compact objects: force representations and conformal geometries
KOVÁŘ, Jiří, Yasufumi KOJIMA, Petr SLANÝ, Zdeněk STUCHLÍK, Vladimír KARAS et. al.Basic information
Original name
Charged fluids encircling compact objects: force representations and conformal geometries
Authors
KOVÁŘ, Jiří (203 Czech Republic, belonging to the institution), Yasufumi KOJIMA, Petr SLANÝ (203 Czech Republic, belonging to the institution), Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution) and Vladimír KARAS (203 Czech Republic)
Edition
Classical and Quantum Gravity, 2020, 0264-9381
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/47813059:19630/20:A0000006
Organization unit
Institute of physics in Opava
UT WoS
000590715200001
Keywords in English
charged fluid toroidal structure; compact object; gravitational field; electromagnetic field; general relativity; force formalism; conformal geometry
Tags
Tags
International impact, Reviewed
Links
GA19-03950S, research and development project.
Změněno: 23/3/2021 18:05, RNDr. Jan Hladík, Ph.D.
Abstract
V originále
Charged fluids rotating around compact objects can form unique equilibrium structures when ambient large-scale electromagnetic fields combine with strong gravity. Equatorial as well as off-equatorial toroidal structures are among such figures of equilibrium with a direct relevance for astrophysics. To investigate their geometrical shapes and physical properties in the near-horizon regime, where effects of general relativity play a significant role, we commonly employ a scheme based on the energy-momentum conservation written in a standard representation. Here, we develop its interesting alternatives in terms of two covariant force representations, both based on a hypersurface projection of the energy-momentum conservation. In a proper hypersurface, space-like forces can be defined, following from a decomposition of the fluid four-acceleration. Each of the representations provides us with an insight into properties of the fluid flow, being well reflected in related conformal hypersurface geometries; we find behaviour of centrifugal forces directly related to geodesics of these conformal hypersurfaces and their embedding diagrams. We also reveal correspondence between the charged fluid flow world-lines from an ordinary spacetime, and world-lines determined by a charged test particles equation of motion in a conformal spacetime.