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- From: mcirvin@husc8.harvard.edu (Mcirvin)
- Newsgroups: sci.physics
- Subject: Re: Some physics questions
- Message-ID: <1992Nov8.165412.17230@husc3.harvard.edu>
- Date: 8 Nov 92 21:54:11 GMT
- Article-I.D.: husc3.1992Nov8.165412.17230
- References: <6NOV199215292345@csa1.lbl.gov> <1dhv1tINNrnh@iskut.ucs.ubc.ca> <1992Nov8.174608.24504@CSD-NewsHost.Stanford.EDU>
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- Organization: Harvard University Science Center
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- In article <1992Nov8.174608.24504@CSD-NewsHost.Stanford.EDU> pratt@Sunburn.Stanford.EDU (Vaughan R. Pratt) writes:
- >With regard to bar length, assume you were carrying a variety of meter
- >bars of different stable materials (I have no idea what materials are
- >sufficiently stable for billions of years). With regard to clock
- >frequency, assume you were carrying a variety of atomic clocks based on
- >hyperfine transitions of various elements. And assume that the
- >observed change was the same to within 10% of the change for all
- >combinations of bars and clocks.
- >
- >Given these circumstances, which parameter would you prefer to say had
- >changed, light speed, bar length, or clock frequency? Or would you
- >prefer to say that there was no basis for choosing among these?
- >--
- >Vaughan Pratt
-
- I would call for further experiments to measure the speed of light in
- terms of purely *nuclear* quantities (some strong interactions have already
- crept in because the hyperfine transition involves the nuclear magnetic
- moment). My first hunch would be to say that the bar lengths and
- the clock frequencies all changed because of a change in the electromagnetic
- coupling constant. It's a matter of economy, really; if the speed of light
- seems to have changed in exactly the same way with regard to all physical
- processes, it seems absurd to say that all of the other physical constants
- got twiddled in such a way as to produce this effect. But if the speed of
- light only seems different when you measure it with bulk matter dependent
- on electromagnetic couplings, I would tend to implicate the coupling of
- electromagnetic fields to matter, and I would start writing down theories
- in which the charge on the electron is determined by a field...
- --
- Matt McIrvin
-