Aspects of cosmic magnetism
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedad Mexicana de Física A.C.
2007
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| _version_ | 1876464530335203328 |
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| author | T. Zannias |
| author_facet | T. Zannias |
| contents | Aspects of cosmic magnetism T. Zannias Física, Astronomía y Matemáticas gravitation compact objects Magnetohydrodynamics In this paper, after a brief review of the current observational evidences regarding the phenomenon of cosmic magnetism, we discuss theproblems associated with the generation of electromagnetic fields by conducting fluid flows. In particularl, we examine the electromagneticfield generated by a conducting fluid flow in the so-called magnetohydrodynamical (MHD) regime in the non-relativistic and general relativisticlimit. Our efforts are directed at the status of Cowlings theorem for the two limits. We show that electromagnetic fields generatedby conducting fluids in an arbitrary spacetime (M; g) are influenced by the conducting and kinematical variables defining the fluid flow, butalso influenced by the curvature and topology of the underlying spacetime. For the particular case of spatially homogeneous and isotropicbackgrounds or stationary-axially symmetric circular spacetimes, we show that the dynamical equations describing electromagnetics fieldsgenerated by particular conducting flows reduce to a form structurally similar to the non-relativistic limit. Despite this siplification, the issuewhether axially symmetric conducting fluid flows can maintain an axisymmetric magnetic field against Ohmic dissipation is still open. 2007 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57066221 https://www.redalyc.org/journal/570/57066221/ https://www.redalyc.org/journal/570/57066221/html/ https://www.redalyc.org/journal/570/57066221/57066221.epub https://www.redalyc.org/journal/570/57066221/movil en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.53 |
| format | Artículo científico |
| id | redalyc_57066221 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Sociedad Mexicana de Física A.C. |
| spellingShingle | Aspects of cosmic magnetism T. Zannias Física, Astronomía y Matemáticas gravitation compact objects Magnetohydrodynamics Aspects of cosmic magnetism T. Zannias Física, Astronomía y Matemáticas gravitation compact objects Magnetohydrodynamics In this paper, after a brief review of the current observational evidences regarding the phenomenon of cosmic magnetism, we discuss theproblems associated with the generation of electromagnetic fields by conducting fluid flows. In particularl, we examine the electromagneticfield generated by a conducting fluid flow in the so-called magnetohydrodynamical (MHD) regime in the non-relativistic and general relativisticlimit. Our efforts are directed at the status of Cowlings theorem for the two limits. We show that electromagnetic fields generatedby conducting fluids in an arbitrary spacetime (M; g) are influenced by the conducting and kinematical variables defining the fluid flow, butalso influenced by the curvature and topology of the underlying spacetime. For the particular case of spatially homogeneous and isotropicbackgrounds or stationary-axially symmetric circular spacetimes, we show that the dynamical equations describing electromagnetics fieldsgenerated by particular conducting flows reduce to a form structurally similar to the non-relativistic limit. Despite this siplification, the issuewhether axially symmetric conducting fluid flows can maintain an axisymmetric magnetic field against Ohmic dissipation is still open. 2007 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57066221 https://www.redalyc.org/journal/570/57066221/ https://www.redalyc.org/journal/570/57066221/html/ https://www.redalyc.org/journal/570/57066221/57066221.epub https://www.redalyc.org/journal/570/57066221/movil en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.53 |
| title | Aspects of cosmic magnetism |
| topic | Física, Astronomía y Matemáticas gravitation compact objects Magnetohydrodynamics |
| url | https://www.redalyc.org/articulo.oa?id=57066221 https://www.redalyc.org/journal/570/57066221/ https://www.redalyc.org/journal/570/57066221/html/ https://www.redalyc.org/journal/570/57066221/57066221.epub https://www.redalyc.org/journal/570/57066221/movil |