From: Eugene Leitl (eugene.leitl@lrz.uni-muenchen.de)
Date: Thu May 27 1999 - 13:36:03 MDT
Anders Sandberg writes:
> Transhuman Mailing List
>
>
> I like Eugene's ambition of a >HTS, but I think we need to integrate a
Thanks.
> space standard too. After all, we will be dealing with relativistic
Agree very much. I just couldn't think of any really global
standard. Using pulsars as timing sources (with compensation for
slowdown) for a kind of a galactic time-of-flight GPS is the best
I can come up with. Unfortunately, the slowdown constant isn't
accurate enough to measure short time spans, and most pulsars are
directed. One should record as many of them as possible, a nice
analogy to GPS satellite coverage.
> stuff and simultanity will becomre tricky (one could set up some kind
> of "mean universal hyperbolic time" based on the "flattest" spacelike
> slices we can foliate the universe with, but the precision will be
> troublesome).
True, but whoever goes skidding around a singularity will know to
readjust his clock when he comes back by synching it with those left
behind. Unfortunately, there are no simple sensors directly measuring
spacetime curvature...
> Maybe one could do something exactly corresponding to the time format
> to measure space, but the coordinate system will be tough. The
> topology censorship conjecture might make spacetime a bit more boring
> that we have hoped, but it is still bendy and tricky. Some way of
> translating local maps into an atlas? This sounds like an area where
> differential geometry and computational geometry could come in handy.
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