Hank Rearden wrote:
How does one measure the curvature of space time?

Ha! You're baiting me.

Take a very long piece of string. Hold on to one end.
Attach a tachyon to the other end. Release the tachyon end.
Masure the curvature of the string as it traces the path of
the tachyon.

Warning: Do Not apply a charge to the tachyon. The resulting
Cherenkov radiation could be hazardous to your health.

--
,,,
..oo
c
- Soque