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Paper IPM / P / 12465  


Abstract:  
Groundstate properties of a twodimensional fluid of bosons with repulsive dipoledipole interactions are
studied by means of the EulerLagrange hypernettedchain approximation.
We present a selfconsistent semianalytical theory of the pair distribution function g(r) and groundstate energy of this system. Our approach is based on the solution of a zeroenergy scattering Schrödinger equation for the "pair amplitude" √{g(r)} with an effective potential from JastrowFeenberg correlations. We find excellent agreement with quantum Monte Carlo results over a wide range of coupling strenght, nearly up to the critical coupling for the liquidtocrystal quantum phase transition. We also calculate the onebody density matrix and related quantities, such as the momentum distribution function and the condensate fraction.
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