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dbpedia:Four-current

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In special and general relativity, the four-current is the four-dimensional analogue of the electric current density, which is used in the geometric context of four-dimensional spacetime, rather than three-dimensional space and time separately. Mathematically it is a four-vector, and is Lorentz covariant.Analogously, it is possible to have any form of "current density", meaning the flow of a quantity per unit time per unit area, see current density for more on this quantity.

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dbpedia:General_relativity dbpedia:Lorentz_transformation n4:s_equations