# Classification of electromagnetic fields in general relativity and its physical applications - General Relativity and Quantum Cosmology

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Abstract: The simplest electromagnetic fields- general- as well asspecial-relativistic classification is formulated which is based on physicallymotivated ideas. According to this classification these fields can belong tothree types electric, magnetic and null, each of them being split in pure andimpure subtypes. Only pure null type field propagates with the fundamentalvelocity $c$, all other fields have the propagation velocity less than that oflight. The reference-frame-based methods of elimination of alternativethree-fields e.g., magnetic in the electric type case are given for puresubtypes; for pure null type the generalized Doppler effect takes placeinstead. All three types of impure fields are shown to be {\bf E}-{\bfB}-parallelizable. Thus such an elimination in pure non-null andparallelization in all impure cases mean transformation to the reference frameco-moving with the electromagnetic field in which the Poynting vector vanishes.The methods we propose modernizing the Rainich-Misner-Wheeler approach, alsopermit to construct new exact Einstein-Maxwell solutions from already knownseed solutions. As examples, the Kerr-Newman and Li\-enard-Wiechert solutionsare considered, three new- types of rotating charged black holes with thesame Kerr-Newman geometry are presented, and new physical effects areevaluated. PACS 2008 Numbers: 04.20-{\bf q}, 04.20.Ex, 04.40.Nr, 04.70.Bw

Autor: Nikolai V. Mitskievich

Fuente: https://arxiv.org/