Talk:Stress-energy tensor

Some questions:

What is $\epsilon$ in expression

$T^{\mu \nu }=\epsilon \left(F^{\mu \lambda }{F_{\lambda }}^{\nu }+{\frac {1}{4}}g^{\mu \nu }F_{\lambda \sigma }F^{\lambda \sigma }\right)$

 ?

What system of units is used? Is it International System of Units or Gaussian units ?

Is there the metric tensor of metric signature (− + + +) used or another metric signature ?

Fedosin (discuss • contribs) 08:17, 28 July 2021 (UTC)