Ground state energy of dilute neutron matter at next-to-leading order in lattice chiral effective field theory

Details Ground state energy of dilute neutron matter at next-to-leading order in lattice chiral effective field theory Ground state energy of dilute neutron matter at next-to-leading order in lattice chiral effective field theory

2008-12-18

arxiv.org/abs/0812.3653v2

Eur. Phys. J. A 40, 199-213 (2009)

Physics

Nuclear Physics

Nuclear Theory

34 pages, 8 figures, journal version to appear in Eur. Phys. J. A

Scientific paper

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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