
#1
Apr2103, 03:39 PM

PF Gold
P: 2,884

It has been asked if there exists an operator representing time. I remember some negative answers, but I do not remember the arguments.
In relativistic QM this relates to the nonexistence of position operators; we are working with an (t,x,1,x2,x3) vector there. Also I believe to remember some provlem with velocity operators its eigenvectors been only +c and c, or so but I am unsure about if both questions are related. also, Energytime indetermination is usedto estimate decay rates of particles. But there an operator is not invoked. 


#2
Apr2103, 05:44 PM

P: n/a

See http://math.ucr.edu/home/baez/uncertainty.html
There is a discussion of the time/energy UP, and a sketch of why there can be no true time operator. 


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