Inserted: 21 may 2020
Last Updated: 5 feb 2021
Journal: Springer INdAM Series
Book chapter in the volume "Mathematical Challenges of Zero-Range Physics".
In this note we present some properties of the Dirac operator on noncompact metric graphs with Kirchoff-type vertex conditions. In particular, we discuss the specific features of the spectrum of the operator and, finally, we give some further details on the associated quadratic form (and on the form domain).