Ground-state properties of the two-dimensional charged Bose gas

We study the two-dimensional gas of charged bosons interacting via a logarithmic potential within the quantal hypernetted-chain approximation. The pair correlation function, the static structure factor, the ground state energy, and the spectrum of collective excitations are calculated over a range of the density parameter r(s). We find that the static and dynamical properties are described rather well in this approach in comparison to previous theories. Our results are in good agreement with the available quantum Monte Carlo simulations.