Fuzzy circle and new fuzzy sphere through confining potentials and energy cutoffs.

by Francesco Pisacane (Università di Napoli "Federico II" & INFN, sezione di Napoli)

Thursday 3 May 2018, 14:30 → 15:30 Europe/Rome

0M03 (Dipartimento di Fisica "Ettore Pancini")

Guided by ordinary quantum mechanics we introduce new fuzzy spheres S^d_L of dimensions d=1,2 covariant under the full orthogonal group O(D), D=d+1. S^d_L is built imposing a suitable energy cutoff on a quantum particle in R^D subject to a confining potential well V(r) with a very sharp minimum on the sphere of radius r=1; the cutoff and the depth of the well depend on (and diverge with) a natural number L. The commutator of the coordinates depends only on the angular momentum, as in Snyder noncommutative spaces. As L diverges the Hilbert space dimension diverges as well, S^d_L goes to S^d, and we recover ordinary quantum mechanics on S^d. These models might be useful in quantum field theory, quantum gravity or condensed matter physics.