Speaker
Stefano Viaggiu
Description
In this talk I present a new proposal concerning the nature of the cosmological constant depicted in terms of Planckian fluctuations.
A semi-classical model is presented with a Planckian generalization of the quasi local Misner-Sharp energy.
The observed (dressed) value of \Lambda is fixed at the scale such that an absolute positive minimum for the generalized Misner-Sharp energy is reached: the new physical scale represents the decoherence one at which the crossover to classicality is obtaned.
Finally, a comparison with the Casimir effect is discussed.
