Ground-state energy of dilute neutron matter at next-to-leading order in lattice chiral effective field theory |
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Authors: | E?Epelbaum H?Krebs D?Lee U?-G?Mei?ner |
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Institution: | 1.Institut für Kernphysik (IKP-3) and Jülich Center for Hadron Physics,Forschungszentrum Jülich,Jülich,Germany;2.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics,Universit?t Bonn,Bonn,Germany;3.Department of Physics,North Carolina State University,Raleigh,USA |
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Abstract: | We present lattice calculations for the ground-state energy of dilute neutron matter at next-to-leading order in chiral effective
field theory. This study follows a series of recent papers on low-energy nuclear physics using chiral effective field theory
on the lattice. In this work we introduce an improved spin- and isospin-projected leading-order action which allows for a
perturbative treatment of corrections at next-to-leading order and smaller estimated errors. Using auxiliary fields and Euclidean-time
projection Monte Carlo, we compute the ground state of 8, 12, and 16 neutrons in a periodic cube, covering a density range
from 2% to 10% of normal nuclear density. |
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Keywords: | PACS" target="_blank">PACS 13 75 Cs Nucleon-nucleon interactions (including antinucleons deuterons etc ) 21 30 -x Nuclear forces 21 60 Ka Monte Carlo models 21 65 Cd Asymmetric matter neutron matter |
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