四維電流密度
Sign in to saveIn special and general relativity, the four-current (technically the four-current density) is the four-dimensional analogue of the current density, with the dimension of electric charge per time per area. Also known as vector current, it is used in the context of four-dimensional spacetime, rather than separating time from three-dimensional space. It is a four-vector and is Lorentz covariant.
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四維電流密度是在相對論中，對應電磁學的電流密度以及電荷密度的四維矢量。 定義為： 是一般的電流密度，是電荷密度，是光速。 * 電流連續方程可寫成 其中D是四維梯度(1/c ∂/∂t, ∇)。 上述方程亦可寫作： （廣義相對論） * 四維電流密度亦應用在馬克士威方程組的相對論形式上：
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