SIMULATION DEVICE, COMPUTER PROGRAM, AND SIMULATION METHOD

PROBLEM TO BE SOLVED: To provide a simulation device, computer program, and simulation method that can overcome a problem of a minus sign while avoiding primary phase transition.SOLUTION: The simulation device includes a magnetization calculation unit that calculates an average of a sum of predetermined direction components of spin as a magnetization in a predetermined direction, an initial Hamiltonian calculation unit that calculates a magnetic field function including a first order term and a second order or higher order term of magnetization as an initial Hamiltonian, a first probability distribution function computing section for computing a probability distribution function with respect to an initial Hamiltonian including a product term of a delta function and a magnetic field function having as a variable a difference between an average of sums of predetermined direction components of magnetization and spin, a spin variable updating unit for updating a spin variable, a determination unit for determining whether or not the series is in equilibrium state, a first magnetization calculating unit for calculating a magnetization in a predetermined direction in a state of equilibrium of the series, a magnetic field calculation unit that calculates a magnetic field in a predetermined direction, a magnetic field determination unit that determines whether or not the magnetic field is in a steady state, and a physical quantity calculation unit that calculates a physical quantity related to the series.SELECTED DRAWING: Figure 1 【課題】一次相転移を回避しつつ負符号問題を解決することができるシミュレーション装置、コンピュータプログラム及びシミュレーション方法を提供する。【解決手段】複数のスピンの所定方向成分の和の平均を所定方向の磁化として演算する磁化演算部と、磁化の一次項及び二次以上の項を含む磁場関数を初期ハミルトニアンとして演算する初期ハミルトニアン演算部と、磁化とスピンの所定方向成分の和の平均との差を変数とするデルタ関数と磁場関数との乗算項を含む、初期ハミルトニアンに対する確率分布関数を演算する第１確率分布関数演算部と、スピン変数を更新するスピン変数更新部と、系が平衡状態になったか否かを判定する判定部と、系の平衡状態での所定方向の磁化を算出する第１磁化算出部と、所定方向の磁場を算出する磁場算出部と、磁場が定常状態であるか否かを判定する磁場判定部と、系に関する物理量を算出する物理量算出部とを備える。【選択図】図１