期刊
EUROPEAN PHYSICAL JOURNAL A
卷 48, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1140/epja/i2012-12058-9
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资金
- BMBF
- GSI
- DFG cluster of excellence: Origin and Structure of the Universe
For a system of fermions with a three-body contact interaction the second-order contributions to the energy per particle (E) over bar (k(f)) are calculated exactly. The three-particle scattering amplitude in the medium is derived in closed analytical form from the corresponding two-loop rescattering diagram. We compare the (genuine) second-order three-body contribution to (E) over bar (k(f)) similar to k(f)(10) with the second-order term due to the density-dependent effective two-body interaction, and find that the latter term dominates. The results of the present study are of interest for nuclear many-body calculations where chiral three-nucleon forces are treated beyond leading order via a density-dependent effective two-body interaction.
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