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arXiv 2203.09291math.PRmath-phmath.MP
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球形自旋玻璃自由能的收敛性

Convergence of the free energy for spherical spin glasses

Eliran Subag

摘要:

证明了任意球型混合$p$ -自旋模型的自由能随着维数$N$趋于无穷大而收敛。虽然收敛性是Parisi公式的结果,但我们给出的证明与公式无关,并使用了著名的Guerra-Toninelli插值方法。后者是为具有伊辛自旋的模型发明的,以证明自由能是超加性的,因此(由$N$归一化)收敛。然而,在球形情况下,配置空间不是积空间,并且不能直接应用插值。我们首先将维度为$N+M$的球上的自由能与定义在维度为$N$和$M$的球的乘积上的自由能相关联,然后我们对其应用插值方法。这就产生了一个近似的超可加性,这足以证明收敛性。

英文摘要:

We prove that the free energy of any spherical mixed $p$-spin model converges as the dimension $N$ tends to infinity. While the convergence is a consequence of the Parisi formula, the proof we give is independent of the formula and uses the well-known Guerra-Toninelli interpolation method. The latter was invented for models with Ising spins to prove that the free energy is super-additive and therefore (normalized by $N$) converges. In the spherical case, however, the configuration space is not a product space and the interpolation cannot be applied directly. We first relate the free energy on the sphere of dimension $N+M$ to a free energy defined on the product of spheres in dimensions $N$ and $M$ to which we then apply the interpolation method. This yields an approximate super-additivity which is sufficient to prove the convergence.

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