AbstractTwo Lagrangian functions are used to construct geometric field theories. One of these Lagrangians depends on the curvature of space, while the other depends on curvature and torsion. It is shown that the theory constructed from the first Lagrangian gives rise to pure gravity, while the theory constructed using the second Lagrangian gives rise to both gravity and electromagnetism. The two theories are constructed in a version of absolute parallelism geometry in which both curvature and torsion are, simultaneously, nonvanishing. One single geometric object, W-tensor, reflecting the properties of curvature and torsion, is defined in this version and is used to construct the second theory. The main conclusion is that a necessary condition for geometric representation of electromagnetism is the presence of a nonvanishing torsion in the geometry used.
|Keywords||Geometrization of physics, a pure geometricmatter tensor, gravity theory, Riemaniann cartan||Issue Date||2010||Publisher||World Scientific publishing company||Source||5||Journal||Modern Physics Letters A||URI||http://research.asu.edu.eg/handle/123456789/2396||DOI||10.1142/S0217732310032883|
Recommend this item
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.