- #1

- 212

- 4

^{ab}(I didn't have a lot of time to make this thread so I did not spend time finding the Greek letters in the latex).

This turns:

R

_{ab}- [itex]\frac{1}{2}[/itex]g

_{ab}R= kT

_{ab}(where k= (8[itex]\pi[/itex]G)/c

^{4})

into this:

R- [itex]\frac{1}{2}[/itex]R = kT

which equals:

[itex]\frac{1}{2}[/itex]R = kT

which yields

R= 2kT= LT (I set L= 2k).

However, many sources say that the reverse trace is:

R= -LT

Why is it negative? Is it based on sign signature?

Note that I general, I use (- + + +) signature.