Quantum Monte Carlo calculation of the equation of state of neutron matter
Quantum Monte Carlo calculation of the equation of state of neutron matter
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DOI：
10.1103/physrevc.79.054005
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发表时间：
2009-03
影响因子：
3.1
通讯作者：
S. Gandolfi;A. Illarionov;K. Schmidt;F. Pederiva;S. Fantoni
中科院分区：
文献类型：
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作者：
S. Gandolfi;A. Illarionov;K. Schmidt;F. Pederiva;S. Fantoni
采用辅助场扩散蒙特卡罗（AFDMC）方法结合固定相近似计算了零温中子物质的物态方程。能量的计算是通过在一个周期性的盒子中模拟多达114个中子来进行的。特别注意的是，通过在相互作用中增加模拟箱截断的影响，以及使用不同数量的中子进行几次模拟，来减少能量评估中的有限尺寸效应。由于动能的有限尺寸效应也检查通过采用扭转平均边界条件。我们考虑了一个现实的核哈密顿量包含现代的二体和三体相互作用的阿贡和厄巴纳家庭。该状态方程可用于比较和校正其它多体计算，并可用于预测中子星的性质。
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.