Comments on the approximating Hamiltonian method for imperfect boson gas

Abstract

In the recent paper (Pulé J V and Zagrebnov V A 2004 The approximating Hamiltonian method for the imperfect boson gas J. Phys. A: Math. Gen. 45 3565–83) the pressure for the imperfect (mean field) boson gas is derived by a method based on the approximating Hamiltonian argument. We give some comments about this derivation.