CP3 Lunch -Quantized cosmological constant in 2d quantum gravity- Simone Zonetti

by Mr Simone Zonetti

Wednesday 17 Nov 2010, 13:00 → 13:50 Europe/Brussels

E/3rd floor-E.349 - Seminar room (E.349) (Marc de Hemptinne (chemin du Cyclotron, 2, Louvain-la-Neuve))

I will present results on the quantization of the cosmological constant occurring in a 2d model of (quantum) gravity coupled with scalar matter. I will show that after a partial gauge fixing the requirement of a quantum realization of the conformal algebra naturally forces the cosmological constant to take values in a well determined spectrum determined by the set of quantum states which are considered to be physical. In addition the gravitational sector gives a negative contribution to the cosmological constant value, in contrast with the positive ones coming from the matter fields, possibly addressing the cosmological constant problem.