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

Understand

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.