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Locality of Temperature

机译:温度的局部性

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This work is concerned with thermal quantum states of Hamiltonians on spin- and fermionic-lattice systems with short-range interactions. We provide results leading to a local definition of temperature, thereby extending the notion of “intensivity of temperature” to interacting quantum models. More precisely, we derive a perturbation formula for thermal states. The influence of the perturbation is exactly given in terms of a generalized covariance. For this covariance, we prove exponential clustering of correlations above a universal critical temperature that upper bounds physical critical temperatures such as the Curie temperature. As a corollary, we obtain that above the critical temperature, thermal states are stable against distant Hamiltonian perturbations. Moreover, our results imply that above the critical temperature, local expectation values can be approximated efficiently in the error and the system size.
机译:这项工作涉及具有短程相互作用的自旋和费米-晶格系统上哈密顿量的热量子态。我们提供的结果导致对温度的局部定义,从而将“温度强度”的概念扩展到相互作用的量子模型。更准确地说,我们导出了热态的摄动公式。扰动的影响是根据广义协方差精确给出的。对于这种协方差,我们证明了在通用临界温度以上的相关性的指数聚类,该临界温度上限是物理临界温度(例如居里温度)的上限。因此,我们得出结论,在临​​界温度以上,热态对远离哈密顿的扰动是稳定的。此外,我们的结果表明,在临界温度以上,可以有效地在误差和系统尺寸上近似本地期望值。

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