1.
Phys Rev Lett
; 105(21): 211601, 2010 Nov 19.
Artigo
em Inglês
| MEDLINE
| ID: mdl-21231288
RESUMO
We obtain the κ-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/(2κ). 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 space-time should be substituted by the concept of a fuzzy region of radius q, as proposed long ago by Heisenberg.