Weyl remainders: an application of geodesic beams

• 成果类型: Article
• 署名作者: Canzani, Yaiza; Galkowski, Jeffrey
• 署名单位: University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine; University of London; University College London
• 刊物名称: INVENTIONES MATHEMATICAE
• ISSN/ISSBN: 0020-9910
• DOI: 10.1007/s00222-023-01178-5
• 发表日期: 2023
• 页码: 1195-1272
• 关键词: riemannian-manifolds; spectral projector; elliptic operator; asymptotics; limit; LAW

摘要

We obtain new quantitative estimates on Weyl Law remainders under dynamical assumptions on the geodesic flow. On a smooth compact Riemannian manifold (M, g) of dimension n, let H(lambda )denote the kernel of the spectral projector for the Laplacian, (1)[0,lambda(2)](-delta(g)). Assuming only that the set of near periodic geodesics over W subset of M has small measure, we prove that as lambda -> infinity integral(W) Pi(lambda) (x, x)dx = (2 pi)(-n) vol(R)(n)(B) volg(W) lambda(n) + O (lambda(n-1)/log lambda),where B is the unit ball. One consequence of this result is that the improved remainder holds on all product manifolds, in particular giving improved estimates for the eigenvalue counting function in the product setup. Our results also include logarithmic gains on asymptotics for the off-diagonal spectral projector H-lambda (x, y) under the assumption that the set of geodesics that pass near both x and y has small measure, and quantitative improvements for Kuznecov sums under non-looping type assumptions. The key technique used in our study of the spectral projector is that of geodesic beams.