Four-acceleration
= Four-acceleration
{wiki=Four-acceleration}
Four-acceleration is a concept from the framework of special relativity and general relativity that describes the change in four-velocity of an object with respect to proper time. It serves as a relativistic generalization of classical acceleration. \#\#\# Definition: Four-acceleration, denoted often as \\( A^\\mu \\), is defined as the derivative of the four-velocity \\( U^\\mu \\) with respect to the proper time \\( \\tau \\).