Re: Lorentz Invariance
From: Tom Roberts (tjroberts_at_lucent.com)
Date: 03/19/05
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Date: Sat, 19 Mar 2005 17:21:29 GMT
Eugene Stefanovich wrote:
> Contrary to common views the Lorentz invariance
> (also called manifest covariance)
Those are QUITE different. Lorentz invariance means that when referenced
to inertial frames, the laws of physics are the same in any inertial
frame, and measurements in different inertial frames are related by
Lorentz transforms. "manifest covariance" (aka general covariance) means
the laws of physics do not depend in any way on coordinates, and is not
restricted to inertial frames. The latter is obvious and necessary for
physics to be possible; the former is somewhat of a surprise (and IMHO
rests more on the peculiarity of inertial frames than on anything else).
> The boost transformations of physical
> observables become rather complex when interactions are involved.
Not true. For simple scattering, the Mandelstamm variable are Lorentz
invariants, and are sufficient to desribe any elastic scattering
independent of what interactions there may be. Similar invariant
variables can be defined for non-elastic interactions....
Tom Roberts tjroberts@lucent.com
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