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From: lyang@sun.uucp (Larry Yang)
Newsgroups: net.physics,net.sci,net.philosophy
Subject: Re: A Sane Man Proposes A Time Travel Experiment
Message-ID: <5594@sun.uucp>
Date: Tue, 29-Jul-86 13:45:04 EDT
Article-I.D.: sun.5594
Posted: Tue Jul 29 13:45:04 1986
Date-Received: Wed, 30-Jul-86 00:50:29 EDT
References: <289@axiom.UUCP> <5723@lanl.ARPA>
Reply-To: lyang@sun.UUCP (Larry Yang)
Organization: Sun Microsystems, Inc.
Lines: 22
Xref: mnetor net.physics:2492 net.sci:1102 net.philosophy:2222

In article <5723@lanl.ARPA> dxm@lanl.ARPA (Douglas Miller) writes:
>Time travel violates the conservation of mass and energy laws.  Consider
>transporting a 1Kg cube of gold 1 hour back in time.  Then in the universe
>of 1 hour ago, there is this extra 1Kg from nowhere, totally unaccounted
>for.  Similarly in the here and now, we lost 1Kg of mass, poof, just like
>that.  Mass wasn't conserved in our universe.  That, as you should well
>realize, is a big no-no.

I used to believe this argument, too, 'til I got my brain out of the
classical view of the universe.  Consider time as an additional dimension.
Now just consider time travel as moving mass/energy from one "point"
in the space-time to another.  Thus , mass/energy is conserved in this new
space-time "universe".  

As an analogy, consider a 2-D universe.  Imagine a 1-kg "square" of gold
begin translated 1 "hour" perpendicular to this plane.  Now our original
universe is now 1-kg less, but the overall universe has the same mass.

Just a psuedo-technical response from a pseudo-person.  Comments/flames
welcome.

-- Larry Yang