nLab Denis O'Brien

• IEEE page

Selected writings

Observation that vacua/ground states of the free Dirac field in a Coulomb background field are characterized by Fredholm operators whose index is the total charge in the vacuum:

• Alan Carey, Charles Angas Hurst, Denis O'Brien, Automorphisms of the canonical anticommutation relations and index theory, Journal of Functional Analysis 48 3 (1982) 360-393 $[$doi:10.1016/0022-1236(82)90092-1$]$

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