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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu
[mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf
Of John Denker
Sent: Saturday, June 19, 2010 3:04 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] how to explain relativity
On 06/18/2010 07:06 PM, Jeffrey Schnick wrote:
I don't get this, it seems to be inconsistent with yourstatement that
<<all the fundamental laws of physics commute withtranslation>>. If
they both have the same a(tau) profile, I think thatwhenever they are
both coasting, their clocks will agree with each other. Please
explain how their clocks become offset by a constant.
Could you or someone else please give a more complete explanation. I
That's an important question. The answer that the principle
is still valid. It disallows some things but allows others.
In this case, each observer can say "If I accelerate to the
right, everybody to the left of me gets redshifted." Such a
statement upholds translation invariance.
It also upholds rotation invariance, which is equally
mandatory. That is, acceleration dot separation is a
rotationally-invariant scalar.
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