Fermionic Squeezed State for Simple Algebraic Models in Many-Fermion Systems

Details Fermionic Squeezed State for Simple Algebraic Models in Many-Fermion Systems Fermionic Squeezed State for Simple Algebraic Models in Many-Fermion Systems

2004-01-12

arxiv.org/abs/nucl-th/0401019v1

Physics

Nuclear Physics

Nuclear Theory

26 pages, 6 figures, Using PTPTeX style

Scientific paper

10.1143/PTP.112.583

It is shown that a variational approach with fermionic squeezed states to many-fermion systems such as pairing model is one of useful methods beyond the usual Hartree-Fock-Bogoliubov approximation. A pairing-type quasi-spin squeezed state is constructed and adopted as a trial state in the variational method. By using this state, quantum fluctuations are taken into account. In pairing model, dynamical and static approaches are discussed in the context of comparing with the Hartree-Fock-Bogoliubov approximation about ground state energy. As a possible extension to the O(4) model, prospective squeezed states are investigated and the usefulness is discussed.

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