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arXiv 2007.10108math.PR
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凸势$\nablaφ$界面Gibbs采样器的谱隙和截止现象

Spectral gap and cutoff phenomenon for the Gibbs sampler of $\nablaφ$ interfaces with convex potential

Pietro Caputo, Cyril Labbé, Hubert Lacoin

摘要:

我们认为吉布斯采样器,或热浴动力学与$\mathbb{R}^N$上的对数凹措施描述$\nablaφ$接口凸势。在对势的最小假设下,我们发现该过程的谱隙总是由$\mathrm{gap}_N=1-\cos(π/N)$给出,并且对于所有的$ε\in(0,1)$,其$ε$ -混合时间满足$T_N(ε)\sim \frac{\log N}{2\mathrm{gap}_N}$为$N\to\infty$,从而建立了截断现象.结果揭示了一个普遍的行为,因为它们不依赖于潜在的选择。

英文摘要:

We consider the Gibbs sampler, or heat bath dynamics associated to log-concave measures on $\mathbb{R}^N$ describing $\nablaφ$ interfaces with convex potentials. Under minimal assumptions on the potential, we find that the spectral gap of the process is always given by $\mathrm{gap}_N=1-\cos(π/N)$, and that for all $ε\in(0,1)$, its $ε$-mixing time satisfies $T_N(ε)\sim \frac{\log N}{2\mathrm{gap}_N}$ as $N\to\infty$, thus establishing the cutoff phenomenon. The results reveal a universal behavior in that they do not depend on the choice of the potential.

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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