Variational approach to the many-body problem with error estimation
I detta arbetet utvecklas en metod för att göra approximativa beräkningar av grundtillståndet för ett kvantmekaniskt system bestående av flera partiklar.In this thesis a method for doing approximate calculations of the ground state of quantum mechanical many-body systems is developed and implemented. This method uses the Hartree-Fock method as a starting point and approximates the ground state as a linear combination of non-orthogonal Slater determinants. The Slater determinants are added consecutively by minimising their associated energy while k