four-velocity

(physics) A generalization of velocity in four-dimensional spacetime

Japanese Meaning

四次元時空における速度の一般化

The four-velocity of the particle defines its trajectory through spacetime and is essential for relativistic dynamics.

粒子の四元速度は時空における軌跡を定め、相対論的力学に不可欠です。

Sense（1）

(physics) A generalization of velocity in four-dimensional spacetime

four-velocities

（ plural ）