Spacetime-noncommutativity regime of Loop Quantum Gravity

por Sr. Michele Ronco (La Sapienza University (Rome))

miércoles 21 sept. 2016 12:00 → 13:00 Europe/Madrid

4-4-4426 - Seminari Física Teòrica (Campus Burjassot)

A recent study by Bojowald and Paily [1] provided a path toward the identification of an effective quantum-spacetime picture of Loop Quantum Gravity, applicable in the "Minkowski regime", the regime where the large-scale (coarse-grained) spacetime metric is flat. A pivotal role in the analysis is played by Loop-Quantum-Gravity-based modifications to the hypersurface deformation algebra, which leave a trace in the Minkowski regime. We here show that the symmetry-algebra results reported by Bojowald and Paily are consistent with a description of spacetime in the Minkowski regime given in terms of the kappa-Minkowski noncommutative spacetime, whose relevance for the study of the quantum-gravity problem had already been proposed for independent reasons. [1] M. Bojowald, G.M. Paily, Phys. Rev. D87, 044044 (2013) 4.