Past and future blurring at fundamental length scale
Abstract
We obtain the -deformed versions of the retarded and advanced Green functions and show that their causality properties are blurred in a time interval of the order of a length parameter q=1/(2). The functions also indicate a smearing of the light cone. These results favor the interpretation of q as a fundamental length scale below which the concept of a point in spacetime should be substituted by the concept of a fuzzy region of radius q, as proposed long ago by Heisenberg.
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