CRITERIA FOR THE BEST BOGOLIUBOV QUASI PARTICLE.
UPPSALA UNIV (SWEDEN) QUANTUM CHEMISTRY GROUP
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The principle of compensation of dangerous diagrams has previously been the only general criterion for determining the coefficients in the Bogoliubov canonical transformation to quasiparticles. It is shown that the criterion of maximum overlap of the true ground state with the BCS ground state gives the same condition for determining the coefficients. The criterion of diagonalizing the quadratic part of the reaction operator, which is a generalization of the BrillouinBrueckner condition, is also equivalent to the above criteria. Finally these criteria are evaluated from the standpoint of least labor for the most accuracy. Author
- Nuclear Physics and Elementary Particle Physics
- Quantum Theory and Relativity
- Solid State Physics