CRITICAL RADIUS AND SUPREMUM OF RANDOM SPHERICAL HARMONICS

• 成果类型: Article
• 署名作者: Feng, Renjie; Adler, Robert J.
• 署名单位: Peking University; Technion Israel Institute of Technology
• 刊物名称: ANNALS OF PROBABILITY
• ISSN/ISSBN: 0091-1798
• DOI: 10.1214/18-AOP1283
• 发表日期: 2019
• 页码: 1162-1184
• 关键词: excursion sets; FIELDS

摘要

We first consider deterministic immersions of the d-dimensional sphere into high dimensional Euclidean spaces, where the immersion is via spherical harmonics of level n. The main result of the article is the, a priori unexpected, fact that there is a uniform lower bound to the critical radius of the immersions as n -> infinity. This fact has immediate implications for random spherical harmonics with fixed L-2 -norm. In particular, it leads to an exact and explicit formulae for the tail probability of their (large deviation) suprema by the tube formula, and also relates this to the expected Euler characteristic of their upper level sets.