@article {2017,
	title = {Discrete spectra for critical Dirac-Coulomb Hamiltonians},
	number = {SISSA;44/2017/MATE},
	year = {2017},
	abstract = {The one-particle Dirac Hamiltonian with Coulomb interaction is known to be realised, in a regime of large (critical) couplings, by an infinite multiplicity of distinct self-adjoint operators, including a distinguished physically most natural one. For the latter, Sommerfeld{\textquoteright}s celebrated fine structure formula provides the well-known expression for the eigenvalues in the gap of the continuum spectrum. Exploiting our recent general
classification of all other self-adjoint realisations, we generalise Sommerfeld{\textquoteright}s formula so as to determine the discrete spectrum of all other self-adjoint versions of the Dirac-Coulomb Hamiltonian. Such discrete spectra display naturally a fibred structure, whose bundle covers the whole gap of the continuum spectrum.},
	url = {http://preprints.sissa.it/handle/1963/35300},
	author = {Matteo Gallone and Alessandro Michelangeli}
}
