[time-nuts] time-nuts Digest, Vol 70, Issue 31

Bob Camp lists at rtty.us
Thu May 13 11:22:03 UTC 2010


If gravity effects are the coupling mechanism, then even pendulums are "speed of light" coupled. 


On May 13, 2010, at 7:13 AM, Eugen Leitl wrote:

> On Thu, May 13, 2010 at 11:09:02AM +0100, Alan Melia wrote:
>> Nice reference thanks for those Stanley...interesting, thought provoking
>> reading! Moving apart and possibly changining the relative positions of the
>> plane of the swing too to test the coupling.  There are ways of measuring
>> this if you have the time :-)) My thought was that even an uncoupled set
>> might move closer together if all subject to the same external "impulse"?
> With physical oscillators coupling is limited by the speed of sound (in
> the medium, with pendulum clocks wood is lots quicker than air with
> 3-4 km/s) with electronic oscillators the speed of light. Latter means
> that their distance has to be short enough so that they lie within
> each other's lightcone within roughly the period of oscillation orelse they
> couldn't possibly causally influence each other.
> At THz half light cone is some 0.3 mm, GHz is about 0.3 m, MHz 300 m, kHz 300 km.
> -- 
> Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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