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• W1963973706 abstract "A system of fermions with a short-range interaction proportional to the scattering length a is studied at finite density. At any order an, we evaluate the complete contributions to the energy per particle E¯(kf) arising from combined (multiple) particle–particle and hole–hole rescatterings in the medium. This novel result is achieved by simply decomposing the particle–hole propagator into the vacuum propagator plus a medium-insertion and correcting for certain symmetry factors in the (n−1)-th power of the in-medium loop. Known results for the low-density expansion up to and including order a4 are accurately reproduced. The emerging series in akf can be summed to all orders in the form of a double-integral over an arctangent function. In that representation the unitary limit a→∞ can be taken and one obtains the value ξ=0.5067 for the universal Bertsch parameter. We discuss also applications to the equation of state of neutron matter at low densities and mention further extensions of the resummation method." @default.
• W1963973706 created "2016-06-24" @default.
• W1963973706 creator A5055421825 @default.
• W1963973706 date "2011-06-01" @default.
• W1963973706 modified "2023-09-28" @default.
• W1963973706 title "Resummation of fermionic in-medium ladder diagrams to all orders" @default.
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• W1963973706 doi "https://doi.org/10.1016/j.nuclphysa.2011.05.005" @default.
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