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- Newsgroups: sci.physics
- Path: sparky!uunet!paladin.american.edu!gatech!nntp.msstate.edu!Ra.MsState.Edu!rsf1
- From: rsf1@Ra.MsState.Edu (Robert S. Fritzius)
- Subject: Re: General Relativity Tests
- Message-ID: <rsf1.726290223@Ra.MsState.Edu>
- Keywords: Advancement in Perihelion, Einstein, Tolman
- Sender: news@ra.msstate.edu
- Nntp-Posting-Host: ra.msstate.edu
- Organization: Mississippi State University
- Date: Wed, 6 Jan 1993 03:17:03 GMT
- Lines: 47
-
-
- This rehash relates to Einstein's and Tolman's expressions for the
- advancement in perihelion of a planet.
-
- In article <richard.7262692433@astro> Richard Mathews writes:
-
- > rsf1@Ra.MsState.Edu (Robert S. Fritzius) writes:
- >> m^2 c^2
- >> 6 * pi * --- * ---- Tolman (8)
- >> r^2 v^2
- >>
- >> 24 * pi v^2
- >> --------- * ----- Einstein (3)
- >> (1 - e^2) c^2
-
- > First, you got the Einstein formula off by a factor of 4. You used
- > <v> = pi * a / T when it should be <v> = 2 * pi / T. Thus the
- > correct Enstein formula expressed as above should say "6 * pi".
-
- Oops!
-
- > In the Tolman formula, note that for a circular Newtonian orbit,
- > m / r = v^2 / G. Substituting this brings the v^2 back to the top.
-
- This would give us:
-
- v^2 * c^2
- 6 * pi * ------------- Tolman (8a)
- G^2
-
- [I have to keep in mind that Eq 8 (not Tolman's original equation) may
- be the product of a "Slick Willy" mindset on my part.]
-
- > The differences in c's and G's are probably due to using c=G=1
- > somewhere when deriving Eq 8 above...
-
- Maybe so, but v^2 * c^ in the numerator of Eq 8a does not strike the
- right chord for me. Even if we set the constants to unity, is there not
- a residual sense of their dimensionality?
-
- Does Eqn 8a seem to be in accord with Tolman's thrust?
-
- Robert S. Fritzius rsf1@ra.msstate.edu
- I have a drool proof terminal.
-
-
-
-