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We present lattice calculations for the ground state energy of dilute neutronmatter at next-to-leading order in chiral effective field theory. This studyfollows a series of recent papers on low-energy nuclear physics using chiraleffective field theory on the lattice. In this work we introduce an improvedspin- and isospin-projected leading-order action which allows for aperturbative treatment of corrections at next-to-leading order and smallerestimated errors. Using auxiliary fields and Euclidean-time projection MonteCarlo, we compute the ground state of 8, 12, and 16 neutrons in a periodiccube, covering a density range from 2% to 10% of normal nuclear density.

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