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Complex coupled-cluster approach to an ab-initio description of open quantum systems
G. Hagen, D. J. Dean, M. Hjorth-Jensen +1
We develop ab-initio coupled-cluster theory to describe resonant and weakly bound states along the neutron drip line. We compute the ground states of the helium chain 3-10He within…
Density-functional theory for the pairing Hamiltonian
T. Papenbrock, Anirban Bhattacharyya
We consider the pairing Hamiltonian and systematically construct its density functional in the strong-coupling limit and in the limit of large particle number. In the former limit,…
Level Repulsion in Constrained Gaussian Random-Matrix Ensembles
T. Papenbrock, Z. Pluhar, H. A. Weidenmueller
Introducing sets of constraints, we define new classes of random-matrix ensembles, the constrained Gaussian unitary (CGUE) and the deformed Gaussian unitary (DGUE) ensembles. The l…
Density functional theory for fermions close to the unitary regime
Anirban Bhattacharyya, T. Papenbrock
We consider interacting Fermi systems close to the unitary regime and compute the corrections to the energy density that are due to a large scattering length and a small effective…