TEST OF VARIATIONAL APPROXIMATION FOR PHI(4) QUANTUM CHAIN BY MONTE-CARLO SIMULATION

被引：1

作者：

JANKE, W ^{[1
]}

SAUER, T ^{[1
]}

机构：

[1] FREE UNIV BERLIN,INST THEORET PHYS,D-14195 BERLIN,GERMANY

来源：

PHYSICS LETTERS A | 1995年 / 197卷 / 04期

关键词：

D O I：

10.1016/S0375-9601(05)80013-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report results of a Monte Carlo simulation of the phi(4) quantum chain. In order to enhance the efficiency of the simulation we combine multigrid simulation techniques with a refined discretization scheme. The resulting accuracy of our data allows for a significant test of an analytical approximation based on a variational ansatz. While the variational approximation is well reproduced for a large range of parameters we find significant deviations for low temperatures and large couplings.

引用

页码：335 / 340

页数：6

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