Seminarium Zakładu Fizyki Teoretycznej

Spin-foam theory is a path integral approach to the problem of Quantum Gravity. It has been conjectured that it is a covariant formulation of Loop Quantum Gravity, but precise link between the theories has been an open problem for many years. In our recent paper we have derived a spin-foam model from canonical Loop Quantum Gravity coupled to massless scalar field. In my talk I will present our model and discuss its possible applications.

Spin-foam theory is a path integral approach to the problem of Quantum Gravity. It has been conjectured that it is a covariant formulation of Loop Quantum Gravity, but precise link between the theories has been an open problem for many years. In our recent paper we have derived a spin-foam model from canonical Loop Quantum Gravity coupled to massless scalar field. In my talk I will present our model and discuss its possible applications.

In this survey, various generalisations of Glauber-Sudarshan coherent states are described in a unified way, with their statistical properties and their possible role in non-standard quantisations of the classical  electromagnetic field. Some statistical photon-counting aspects of Perelomov SU(2) and SU(1,1) coherent states are emphasized.