[seminar] DANAS: Predavanje Shapiro, 11:00 c.t., IRB, I krilo

[Larisa Jonke]

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


Quantum Gravity from the Quantum Field Theory Perspective

Ilya L. Shapiro
Universidade federal de Juiz de Fora, MG, Brazil

Prvo u  SERIJI PREDAVANJA
Institut Rudjer Boskovic, predavaonica I krila
Srijeda, 27. ozujka, 11:00 c.t.


Sazetak:
A short introductory and review course in perturbative Quantum  
Gravity. We describe the Lagrangian quantization and sketch the  
standard demonstration of diffeomorphism invariant renormalizability  
of the theory.
The analysis of power counting shows that there are possibilities for  
non-renormalizable, renormalizable and super-renormalizable models of  
Quantum Gravity, but in the last two cases we meet a problem of  
unphysical massive ghosts and unitarity of S-matrix for gravitons.  
Possible solutions of this problem are discussed, including some  
related to the effective
approach to Quantum Field Theory (QFT). Alternative possibilities  
include various versions (in general, very different) of induced  
gravity and also treating Quantum Gravity as effective QFT at low  
energies. Some critical considerations concerning the last case are  
given.


Voditeljica seminara:
Larisa Jonke