電荷・電流密度
1. Four-currentIn special and general relativity, the four-current is the 4-dimensional analogue of the electric current density, which is used in the geometric context of 4d spacetime, rather than 3d space and time separately. Mathematically it is a four-vector, and is Lorentz covariant. Analogously, it's 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.
Read “Four-current” on English Wikipedia
Read “電荷・電流密度” on Japanese Wikipedia
Read “Four-current” on DBpedia
Read “Four-current” on English Wikipedia
Read “電荷・電流密度” on Japanese Wikipedia
Read “Four-current” on DBpedia
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