- #1
Emil_M
- 46
- 2
Hi!
Let ##T^{ik}## be the stress-energy-tensor, and ##v_k## some future-pointing, time-like four vector.
How can I see that the object ##T^{ik}v_k## is future-pointing and not space-like?
Thank you for your help!
Let ##T^{ik}## be the stress-energy-tensor, and ##v_k## some future-pointing, time-like four vector.
How can I see that the object ##T^{ik}v_k## is future-pointing and not space-like?
Thank you for your help!