What is Spacetime metric?
In [[special relativity]], the '''spacetime metric''', also called the '''Minkowski metric'''', is the [[metric tensor]] that describes the [[line element]] in [[Minkowski spacetime]]. ==The metric== The metric can be described by the following line element: <math>ds^2=c^2dt^2-(dx^1)^2-(dx^2)^2-(dx^3)^2</math> In units where the [[speed of light]], <math>c</math>, is one, then the metric in [[matrix]] form is <math>diag(1,-1,-1,-1)</math> [[Category:Relativity]] {{physics-stub}}