2016/02/03 by Francisco Cabral, Francisco S. N. Lobo · 4 citations
Physics and Astronomy · #Axiom #Classical electromagnetism #Differential geometry #Electromagnetism #Lorentz transformation #Maxwell's equations in curved spacetime #Minkowski space #Quantum Electrodynamics and Casimir Effect #Quantum and Classical Electrodynamics #Relativity and Gravitational Theory #Spacetime #Spacetime topology #Theory of relativity #gr-qc #hep-th
paper · pdf · doi:10.1007/s10701-016-0051-6
published as Found Phys (2017) 47: 208 · 21 pages
arxiv created 2016/02/03 · openalex created_date 2016/06/24 · openalex publication_date 2016/11/14 · arxiv updated 2017/02/14 · openalex updated_date 2026/08/05
We explore the intimate connection between spacetime geometry and electrodynamics. This link is already implicit in the constitutive relations between the field strengths and excitations, which are an essential part of the axiomatic structure of electromagnetism, clearly formulated via integration theory and differential forms. We briefly review the foundations of electromagnetism based on charge and magnetic flux conservation, the Lorentz force and the constitutive relations which introduce the spacetime metric. We then proceed with the tensor formulation by assuming local, linear, homogeneous and isotropic constitutive relations, and explore the physical, observable consequences of Maxwell's equations in curved spacetime. The field equations, charge conservation and the Lorentz force are explicitly expressed in general (pseudo) Riemanian manifolds. The generalized Gauss and Maxwell-Ampère laws, as well as the wave equations, reveal potentially interesting astrophysical applications. In all cases new electromagnetic couplings and related phenomena are induced by spacetime curvature. The implications and possible applications for gravity waves detection are briefly addressed. At the foundational level, we discuss the possibility of generalizing the vacuum constitutive relations, by relaxing the fixed conditions of homogeneity and isotropy, and by assuming that the symmetry properties of the electro-vacuum follow the spacetime isometries. The implications of this extension are briefly discussed in the context of the intimate connection between electromagnetism and the geometry (and causal structure) of spacetime.