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From: hutch@shark.UUCP (Stephen Hutchison)
Newsgroups: net.misc,net.physics
Subject: Re: perpetual motion
Message-ID: <1307@shark.UUCP>
Date: Mon, 1-Apr-85 01:00:29 EST
Article-I.D.: shark.1307
Posted: Mon Apr  1 01:00:29 1985
Date-Received: Thu, 4-Apr-85 05:36:06 EST
References: <608@vortex.UUCP> <368@talcott.UUCP> <9347@brl-tgr.ARPA> <5079@elsie.UUCP> <262@rtech.ARPA>
Reply-To: hutch@shark.UUCP (Stephen Hutchison)
Organization: Tektronix, Wilsonville OR
Lines: 32
Xref: watmath net.misc:7756 net.physics:2390
Summary: 

[ Time-invariant bug poison ]

In article <262@rtech.ARPA> jeff@rtech.ARPA (Jeff Lichtman) writes:
>> 
>> 	Could someone kindly translate the above into English
>> 	for those of us who don't often see phrases like
>> 	"time translation invariance"
>> 		 and
>> 	"vanishing divergence of stress-energy-momentum tensor"?
>> 
>> 	Thanks.
>
>"Time translation invariance" means that the laws of physics don't change with
>time.  The results of an experiment are the same, regardless of when you do it.
>This law and the law of conservation of energy are equivalent. I don't know how
>to prove this, but I read it in a book on the fundamentals of physics.
>
>I don't know what "vanishing divergence of stress-energy-momentum tensor"
>means.
>-- 
>Jeff Lichtman at rtech (Relational Technology, Inc.)
>aka Swazoo Koolak

UUUUuuuuummmm....  I have a question, please pardon my ignorance, but about
three years ago I read a short article in "Science News" which claimed that
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