Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-05-05
Phys.Lett. B617 (2005) 193-197
Physics
High Energy Physics
High Energy Physics - Theory
6 pages; to appear in Physics Letters B
Scientific paper
10.1016/j.physletb.2005.05.023
The field equations for gravitation and electromagnetism with sources in four dimensions can be interpreted as arising from the vacuum Einstein equations in five dimensions. Gauge invariance of the electromagnetic potentials leads to a ``generalized'' electromagnetic field tensor. We use the action principle to derive the equations of motion for free electromagnetic fields in flat spacetime, and isolate an effective electromagnetic current with a source that is purely higher-dimensional in origin. This current provides, at least in principle, a means of detecting extra dimensions experimentally.
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