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From: ethan@utastro.UUCP (Ethan Vishniac)
Newsgroups: net.misc,net.physics
Subject: Re: perpetual motion
Message-ID: <39@utastro.UUCP>
Date: Thu, 4-Apr-85 14:29:51 EST
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Posted: Thu Apr  4 14:29:51 1985
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Organization: U. Texas, Astronomy, Austin, TX
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> [ Time-invariant bug poison ]

> they had found evidence that the weak and strong nuclear forces were actually
> a unified force which split when the universe "cooled" (expanded?) to its
> present "temperature" of about 4 degrees Kelvin.  Would it not be true that
> before this time, that some experiments would show different results?
> Or was this simply a poor translation of what the original math showed?
> 
> Hutch

Picky little point:  The present temperature of the universe is about
    2.7 degrees Kelvin. (To within about 0.1 or 0.2 degrees)

Major point:  "Time translation invariance" means changing the time and
   nothing else.  As the nature of the vacuum of the universe changes
   the results of experiments within it change.  However, you could
   imagine constructing a box which was kept at a constant temperature.
   Then (if the box were big enough to avoid boundary problems) the
    time of the experiment would be irrelevant.

Picky little point:  There is a successful unified theory of *electromagnetism*
     and the weak nuclear force.  There are various (as yet unsuccessful)
     attempts to unify this theory with quantum chromodynamics (the fundamental
     theory of the strong nuclear force).


"Don't argue with a fool.      Ethan Vishniac
 Borrow his money."            {charm,ut-sally,ut-ngp,noao}!utastro!ethan
                               Department of Astronomy
                               University of Texas