Re: Simultaneity in curved space
From: Daryl McCullough (daryl_at_atc-nycorp.com)
Date: 06/11/04
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Date: 11 Jun 2004 12:44:32 -0700
Mike says...
>In flat spacetime, the following questions cannot be answered:
>
>1. How far apart are two events in space?
>2. How far apart are two events in time?
>3. Are two events simultaneous?
>4. Are two events at the same place in space?
That's true if you mean absolute answers. But in flat spacetime,
those questions all have answers *relative* to a choice of rest
frame. In curved spacetime, there is not even a unique answer
relative to an observer. The answers are relative to a coordinate
system, and there is no best coordinate system for a particular
observer.
-- Daryl McCullough Ithaca, NY
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