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arXiv 1105.2604math.PR
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具有铁磁相互作用的混合偶自旋Sherrington-Kirkpatrick模型

On the Mixed Even-Spin Sherrington-Kirkpatrick Model with Ferromagnetic Interaction

Wei-Kuo Chen

摘要:

研究了一个同时具有均匀自旋Sherrington-Kirkpatrick(SK)耦合和Curie-Weiss(CW)相互作用的自旋系统.我们的主要结果是:(i)自由能的热力学极限由涉及SK模型的自由能随外场变化的变分公式给出。(ii)在中心高斯外场的存在下,重叠和扩展的Ghirlanda-Guerra恒等式的正性在温度参数的稠密子集上保持。(iii)我们建立了磁化和重叠之间的一般不等式。(iv)我们构建了一个温度区域,在该区域中的磁化强度可以定量控制,并推导出不同的意义上的磁化强度的收敛取决于外部场是否存在或不存在。我们的方法是基于CW和SK模型的研究和凸分析的结果的技术。

英文摘要:

We study a spin system with both mixed even-spin Sherrington-Kirkpatrick (SK) couplings and Curie-Weiss (CW) interaction. Our main results are: (i) The thermodynamic limit of the free energy is given by a variational formula involving the free energy of the SK model with a change in the external field. (ii) In the presence of a centered Gaussian external field, the positivity of the overlap and the extended Ghirlanda-Guerra identities hold on a dense subset of the temperature parameters. (iii) We establish a general inequality between the magnetization and overlap. (iv) We construct a temperature region in which the magnetization can be quantitatively controlled and deduce different senses of convergence for the magnetization depending on whether the external field is present or not. Our approach is based on techniques from the study of the CW and SK models and results in convex analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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