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- Newsgroups: sci.physics
- Path: sparky!uunet!cs.utexas.edu!tamsun.tamu.edu!zeus.tamu.edu!dwr2560
- From: dwr2560@zeus.tamu.edu (RING, DAVID WAYNE)
- Subject: Re: Is Spacetime Absolute?
- Message-ID: <5SEP199212311308@zeus.tamu.edu>
- News-Software: VAX/VMS VNEWS 1.41
- Sender: news@tamsun.tamu.edu (Read News)
- Organization: Texas A&M University, Academic Computing Services
- References: <1992Sep5.022449.1512@prim>
- Date: Sat, 5 Sep 1992 17:31:00 GMT
- Lines: 20
-
- prim!dave@germany.eu.net (Dave Griffiths) writes...
- >I think what I am asking is, is there an objective spacetime fabric out there
- >through which all particles move? Or does a different universe exist from the
- >perspective of every particle?
-
- Perhaps Quantum gravity will have the answer. :)
-
- >Um... also... how does an object "know" that it is spinning relative to
- >the "fixed" stars? (Relative to the object, all it's particles are at rest
- >and only the universe is spinning).
-
- This is the gravitational interaction. The effect of distant masses can be
- completely described by specifying which frames at each spacetime point
- are inertial. Whatever equation tells you what the metric is now, given
- the initial conditions is what brings the 'info' to you. I would like to
- say it's Einstein's equation, but there's some subtle issues here that
- I don't understand, so I won't.
-
- Dave Ring
- dwr2560@zeus.tamu.edu
-