Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 40, Issue 2, Pages 199-213Publisher
SPRINGER
DOI: 10.1140/epja/i2009-10755-0
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Funding
- Deutsche Forschungsgemeinschaft [SFB/TR 16]
- U.S. Department of Energy [DEFG02-03ER41260]
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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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