Dear Friends(adsbygoogle = window.adsbygoogle || []).push({});

Bearing in mind the special relativity definition of "observer" (a system of rods and clock disposed everywhere in the space), what's the

operational definition of four velocity (and therefore of four acceleration, four force, etc)?

Obviously, no problems in detecting the displacement's components of the

traveling particle (in the observer's reference frame) but how about the proper time tau? I'm mulling about two possibilities:

(1)

The observer can measure the time using its clocks and then use

dt = gamma dtau

(but I don't like it, because it repose on too theoretical premises and it's no really "experimental fashioned" )

(2)

Time can be measured in the respect of the reference frame comoving with the traveling particle, but this is not an inertial one so more dilemmas

rise up.

I would love to hear your thoughts about that.

Thanks for unscrambling my English.

Have a great day !!

Barbara Da Vinci

Rome

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# Operational definition of four velocity

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