dorsal/arxiv
View SchemaNeutron matter at zero temperature with auxiliary field diffusion Monte Carlo
| Authors | A. Sarsa, S. Fantoni, K. E. Schmidt, F. Pederiva |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0303035 |
| URL | https://arxiv.org/abs/nucl-th/0303035 |
| DOI | 10.1103/PhysRevC.68.024308 |
| Journal | Phys.Rev. C68 (2003) 024308 |
Abstract
The recently developed auxiliary field diffusion Monte Carlo method is applied to compute the equation of state and the compressibility of neutron matter. By combining diffusion Monte Carlo for the spatial degrees of freedom and auxiliary field Monte Carlo to separate the spin-isospin operators, quantum Monte Carlo can be used to simulate the ground state of many nucleon systems $(A\alt 100)$. We use a path constraint to control the fermion sign problem. We have made simulations for realistic interactions, which include tensor and spin--orbit two--body potentials as well as three-nucleon forces. The Argonne $v_8'$ and $v_6'$ two nucleon potentials plus the Urbana or Illinois three-nucleon potentials have been used in our calculations. We compare with fermion hypernetted chain results. We report results of a Periodic Box--FHNC calculation, which is also used to estimate the finite size corrections to our quantum Monte Carlo simulations. Our AFDMC results for $v_6$ models of pure neutron matter are in reasonably good agreement with equivalent Correlated Basis Function (CBF) calculations, providing energies per particle which are slightly lower than the CBF ones. However, the inclusion of the spin--orbit force leads to quite different results particularly at relatively high densities. The resulting equation of state from AFDMC calculations is harder than the one from previous Fermi hypernetted chain studies commonly used to determine the neutron star structure.
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"abstract": "The recently developed auxiliary field diffusion Monte Carlo method is\napplied to compute the equation of state and the compressibility of neutron\nmatter. By combining diffusion Monte Carlo for the spatial degrees of freedom\nand auxiliary field Monte Carlo to separate the spin-isospin operators, quantum\nMonte Carlo can be used to simulate the ground state of many nucleon systems\n$(A\\alt 100)$. We use a path constraint to control the fermion sign problem. We\nhave made simulations for realistic interactions, which include tensor and\nspin--orbit two--body potentials as well as three-nucleon forces. The Argonne\n$v_8\u0027$ and $v_6\u0027$ two nucleon potentials plus the Urbana or Illinois\nthree-nucleon potentials have been used in our calculations. We compare with\nfermion hypernetted chain results. We report results of a Periodic Box--FHNC\ncalculation, which is also used to estimate the finite size corrections to our\nquantum Monte Carlo simulations. Our AFDMC results for $v_6$ models of pure\nneutron matter are in reasonably good agreement with equivalent Correlated\nBasis Function (CBF) calculations, providing energies per particle which are\nslightly lower than the CBF ones. However, the inclusion of the spin--orbit\nforce leads to quite different results particularly at relatively high\ndensities. The resulting equation of state from AFDMC calculations is harder\nthan the one from previous Fermi hypernetted chain studies commonly used to\ndetermine the neutron star structure.",
"arxiv_id": "nucl-th/0303035",
"authors": [
"A. Sarsa",
"S. Fantoni",
"K. E. Schmidt",
"F. Pederiva"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.68.024308",
"journal_ref": "Phys.Rev. C68 (2003) 024308",
"title": "Neutron matter at zero temperature with auxiliary field diffusion Monte Carlo",
"url": "https://arxiv.org/abs/nucl-th/0303035"
},
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