[seminar] Gherardo Piacitelli, 09. ozujka 2011. (srijeda) u 11:00 c.t., IRB, seminar ZTF-a

[Hrvoje Nikolic]

       INSTITUT Rudjer Boskovic
       ZAVOD ZA TEORIJSKU FIZIKU
       Bijenicka c. 54, Zagreb, Hrvatska


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                      SEMINAR ZAVODA ZA TEORIJSKU  FIZIKU
             (Zajednicki seminari Zavoda za teorijsku fiziku i
                 Zavoda za eksperimentalnu fiziku IRB-a i
                 Zavoda za teorijsku fiziku PMF-a)

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         Gherardo Piacitelli, SISSA, Trieste, Italy


     "On models of quantum spacetime"

       Vrijeme:  09. ozujka 2011. (srijeda), 11:00, c.t.

       Mjesto:  Institut Rudjer Boskovic, Seminar ZTF-a

       Sazetak:
Quantum spacetime is a particular class of noncommutative models, where
commutation relations among the  coordinates are assumed. The DFR model
of 1995 is based on physical motivations, which will be shortly
recalled. It describes a flat spacetime, suitable for describing
isolated highly energetic processes (no global curvature), as a very
preliminar, intermediate step towards quantum gravity.
Here the coordinates are not interpreted as observables, but as
generators of the localisation algebra. They play the same role of the x
dependence of an ordinary quantum field A(x); evaluation of localisation
states on the coordinates play the same role as smearing with test
functions. The relation between Weyl quantisation and other approaches 
based on *-products will be shortly analysed. We will finally discuss some 
aspects of the effective nonlocal theories describing scattering processes 
on quantum spacetime. This material is covered by the review: 
[arXiv:1004.5261] and refereces therein.



      Voditelj seminara:
      Hrvoje Nikolic (hrvoje at thphys.irb.hr)


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