Re: How can neutrons have magnetism if they have no electricity?

Paul Danaher wrote:

Except that AFAIK (I can't access many of the google references, thanks to Springer et al - no relative) the jury is still out on whether T reversal symmetry is experimentally confirmed. I'm looking at narrowing error bars on upper limits

Any deviation from a law can only be 'confirmed' by narrowing error bars
for the parameters modeling the deviation. As long as the error bars
contain zero, the law counts as confirmed.

With time, confirmation of the law may be at a higher level of accuracy,
or (as in the case of neutron masses) confirmation of the deviation
(if the more accurate error bars no longer contain zero).

If you dispute T reversal symmetry because of not enough confirmation,
you can as well dispute Lorentz symmetry, translation invariance,
zero photon mass, general relativity, etc., which are all confirmed only
to a certain precision.


Arnold Neumaier

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