Auxiliary-field quantum Monte Carlo simulations of neutron matter in chiral effective field theory.
We present variational Monte Carlo calculations of the neutron matter equation of state using chiral nuclear forces. The ground-state wave function of neutron matter, containing nonperturbative many-body correlations, is obtained from auxiliary-field quantum Monte Carlo simulations of up to about 340 neutrons interacting on a 10(3) discretized lattice. The evolution Hamiltonian is chosen to be attractive and spin independent in order to avoid the fermion sign problem and is constructed to best reproduce broad features of the chiral nuclear force. This is facilitated by choosing a lattice spacing of 1.5 fm, corresponding to a momentum-space cutoff of Λ=414  MeV/c, a resolution scale at which strongly repulsive features of nuclear two-body forces are suppressed. Differences between the evolution potential and the full chiral nuclear interaction (Entem and Machleidt Λ=414  MeV [L. Coraggio et al., Phys. Rev. C 87, 014322 (2013).
Faculty of Physics, Warsaw University of Technology, Ulica Koszykowa 75, 00-662 Warsaw, Poland and Department of Physics, University of Washington, Seattle, Washington 98195, USA.
G
G
Wlazłowski
Department of Physics, University of Washington, Seattle, Washington 98195, USA.
J W
JW
Holt
Department of Physics, University of Washington, Seattle, Washington 98195, USA.
S
S
Moroz
Department of Physics, University of Washington, Seattle, Washington 98195, USA.
A
A
Bulgac
Department of Physics, University of Washington, Seattle, Washington 98195, USA and Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
K J
KJ
Roche