Abstract
A direct configuration interaction approach for studies of bosonic systems has been developed and implemented. The methods have been applied on model systems consisting of charged bosons in a central Coulomb field. By increasing the size of the one-particle basis sets for a fixed number of bosons, the computational efforts increase quadrically as a function of the number of configurations, whereas by increasing the number of bosons for a fixed basis set, the methods scale almost linearly with the size of the configuration space. The test calculations also show that a truncated configuration interaction model considering only single and double replacements from the reference accounts for nearly 100% of the correlation energy. The present configuration interaction program can easily be modified for computational studies of other kinds of bosonic systems because the only quantities containing information about the system under consideration are the interaction strength integrals.
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