Quantum Monte Carlo calculation of the equation of state of neutron matter

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.054005· OSTI ID:21286926

Gandolfi, S; Illarionov, A Yu; Schmidt, K E; Pederiva, F; Fantoni, S ^[1]

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1. International School for Advanced Studies, SISSA Via Beirut 2/4 I-34014 Trieste (Italy) and INFN, Sezione di Trieste, Trieste (Italy)

We calculated the equation of state of neutron matter at zero temperature by means of the auxiliary field diffusion Monte Carlo (AFDMC) method combined with a fixed-phase approximation. The calculation of the energy was carried out by simulating up to 114 neutrons in a periodic box. Special attention was given to reducing finite-size effects at the energy evaluation by adding to the interaction the effect due to the truncation of the simulation box, and by performing several simulations using different numbers of neutrons. The finite-size effects due to kinetic energy were also checked by employing the twist-averaged boundary conditions. We considered a realistic nuclear Hamiltonian containing modern two- and three-body interactions of the Argonne and Urbana family. The equation of state can be used to compare and calibrate other many-body calculations and to predict properties of neutron stars.

• OSTI ID: 21286926
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
BOUNDARY CONDITIONS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DIFFUSION
EQUATIONS OF STATE
HAMILTONIANS
INTERACTIONS
KINETIC ENERGY
MONTE CARLO METHOD
NEUTRON STARS
NEUTRONS
NUCLEAR MATTER
PERIODICITY
TEMPERATURE ZERO K
THREE-BODY PROBLEM