Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Theorie
HK 12.4: Vortrag
Freitag, 4. März 2005, 17:30–17:45, TU MA041
Nuclear Lattice Simulations with Chiral Effective Field Theory — •B. Borasoy1, D. Lee1, and T. Schaefer2 — 1Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Germany — 2Physics Department, North Carolina State University, Raleigh, USA
We study nuclear and neutron matter by combining chiral effective field theory with non-perturbative lattice methods and treating nucleons and pions as point particles on a lattice. This allows us to probe larger volumes, lower temperatures, and greater nuclear densities than in lattice QCD. The low energy interactions of these particles are governed by chiral effective theory and operator coefficients are determined by fitting to zero temperature few-body scattering data. The leading dependence on the lattice spacing can be understood from the renormalization group and absorbed by renormalizing operator coefficients. In this way a realistic simulation of many-body nuclear phenomena is obtained with no free parameters, a systematic expansion, and a clear theoretical connection to QCD. Results for hot neutron matter at temperatures 20 to 40 MeV and densities below twice nuclear matter density are presented.
Financial support of the DFG, DOE and NSF is gratefully acknowledged.
- [1] D. Lee, B. Borasoy and T. Schaefer, Phys. Rev. C70 (2004) 014007.