Energy and electromagnetism of a differential k-form

Details Energy and electromagnetism of a differential k-form Energy and electromagnetism of a differential k-form

2012-01-17

arxiv.org/abs/1201.3504v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

33 pages. Minor corrections

Scientific paper

Let X be a smooth manifold of dimension 1+n endowed with a lorentzian metric g, and let T be the electromagnetic energy tensor associated to a 2-form F. In this paper we characterize this tensor T as the only 2-covariant natural tensor associated to a lorentzian metric and a 2-form that is independent of the unit of scale and satisfies certain condition on its divergence. This characterization is motivated on physical grounds, and can be used to justify the Einstein-Maxwell field equations. More generally, we characterize in a similar manner the energy tensor associated to a differential form of arbitrary order k. Finally, we develop a generalized theory of electromagnetism where charged particles are not punctual, but of an arbitrary fixed dimension p. In this theory, the electromagnetic field F is a differential form of order 2+p and its electromagnetic energy tensor is precisely the energy tensor associated to F.

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