Wednesday, July 3, 2013

1307.0479 (A. P. C. Malbouisson)

Uncertainty principle in a cavity at finite temperature    [PDF]

A. P. C. Malbouisson
We employ a dressed state approach to perform a study on the behavior of the uncertainty principle for a system in a heated cavity. We find, in a small cavity for a given temperature, an oscillatory behavior of the momentum--coordinate product, $(\Delta\,p)\,(\Delta\,q)$, which attains periodically finite absolute minimum (maximum) values, no matter large is the elapsed time. This behavior is in a sharp contrast with what happens in free space, in which case, the product $(\Delta\,p)\,(\Delta\,q)$ tends asymptotically, for each temperature, to a constant value, independent of time.
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