BEC-BCS crossover of a trapped Fermi gas beyond the local density approximation
We perform a Variational Quantum Monte Carlo simulation of an interacting ::: Fermi gas confined in a three dimensional harmonic potential. This gas is considered as the precursor system from which a molecular bosonic gas is formed. Based in the results of two-body calculations for trapped atoms, we propose a family of variational many-body wave functions that takes into account the qualitative different nature of the BCS and BEC regimes as a function of the scattering length. Energies, densities and correlations functions are calculated and compared with previous results for homogeneous gases. Universality tests at the unitarity limit are also performed.
Abstract Using the Stochastic Frontier Approach (SFA) and Data Envelope Analysis (DEA), this study examines the influence of bank efficiencies on the market assessment of bank holding company (BHC) mergers. The following two questions are addressed: (1) Is the target BHC's frontier efficiency reflected in the bidder BHC's abnormal returns? and (2) Does the difference in frontier efficiency between the bidder and/or target banks relative to their peer institutions influence the acquirer's abnormal returns? In support of the Inefficient Management Hypothesis, the findings indicate that bidder wealth effects do incorporate the target's X-efficiency as well as the difference in bidder/target efficiencies relative to their peer institutions.