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arXiv 2407.04875math.PRmath-phmath.MP
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ℓp约束下的Curie-Weiss模型与广义Hubbard-Stratonovich变换

Curie-Weiss Model under $\ell^{p}$ constraint and a Generalized Hubbard-Stratonovich Transform

Partha S. Dey, Daesung Kim

AI总结:

本文研究ℓp范数约束下完全图上Ising Curie-Weiss模型的相变行为,证明p>2时存在临界温度βc(p)且磁化强度在临界值两侧分别呈现高斯集中与±m*集中,并将结果推广到一般对称自旋分布,证明基于新提出的广义Hubbard-Stratonovich变换。

摘要:

我们考虑在给定某个p>0的ℓp范数约束下完全图上的Ising Curie-Weiss模型。当p=∞时,该模型退化为经典的Ising Curie-Weiss模型。我们证明,对于所有p>2,存在βc(p),使得当β<βc(p)时,磁化强度集中在零处并满足适当的高斯中心极限定理(CLT);相反,当β>βc(p)时,磁化强度集中在±m*处,其中m*>0。对于p>2,有βc(p)>1,且lim_{p→∞}βc(p)=3。我们进一步将该模型推广到一般对称自旋分布,并证明了类似的相变。对于0<p<1,对数配分函数以n^{2/p-1}的量级缩放。证明基于广义Hubbard-Stratonovich(GHS)变换,该变换具有独立的研究价值。

英文摘要:

We consider the Ising Curie-Weiss model on the complete graph constrained under a given $\ell^{p}$ norm for some $p>0$. For $p=\infty$, it reduces to the classical Ising Curie-Weiss model. We prove that for all $p>2$, there exists $β_{c}(p)$ such that for $β<β_{c}(p)$, the magnetization is concentrated at zero and satisfies an appropriate Gaussian CLT. In contrast, for $β>β_{c}(p)$ the magnetization is concentrated at $\pm m_\ast$ for some $m_\ast>0$. We have $β_{c}(p)>1$ for $p>2$ and $\lim_{p\to\infty}β_{c}(p)=3$. We further generalize the model for general symmetric spin distributions and prove a similar phase transition. For $0<p<1$, the log-partition function scales at the order of $n^{2/p-1}$. The proofs are based on a generalized Hubbard-Stratonovich (GHS) transform, which is of independent interest.

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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