Diagonalisation of the Dirac Hamiltonian as a basis for a relativistic many-body procedure

  • Heully J
  • Lindgren I
  • Lindroth E
 et al. 
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A diagonalisation procedure of the Foldy-Wouthuysen type is considered for the single-electron Dirac
Hamiltonian as a basis for many-body applications. A modified procedure is suggested. In the
diagonalisation procedure the Dirac equation is completely decoupled into two equations of the Pauli
type. The expressions for positive- and negative-energy projection operators in the transformed
basis are then trivial and, by performing the inverse transformation, projection operators for Dirac
functions are obtained. Applying a similar transformation to the two-electron Dirac-Coulomb
Hamiltonian leads to a diagonalised single-electron part and a non-diagonal two-electron
interaction. In principle, the effect of the exchange of virtual, transverse photons (Breit
interactions) can also be included in the electron-electron interaction and transformed in a similar
way. It is indicated how a diagonalisation procedure of this kind can be used as a basis for
relativistic many-body calculations in the coupled cluster formulation in analogy with the
corresponding non-relativistic procedure.

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  • Eva LindrothStockholms Universitet

  • Jean Louis Heully

  • Ingvar Lindgren

  • Stig Lundqvist

  • Ann Marrie Martensson-Pendrill

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