English

Entropy of logarithmic modes

Spectral Theory 2024-08-07 v4 Mathematical Physics Dynamical Systems math.MP

Abstract

Let (M,g)(M,g) be a compact, boundaryless, Riemannian manifold whose geodesic flow on its unit sphere bundle is Anosov. Consider the (semiclassical) Laplace-Beltrami operator on MM. Let ϵ>0\epsilon >0. We study the semiclassical measures μsc\mu_{sc} of quasimodes spectrally supported in intervals of width ϵhlogh\epsilon \frac{h}{|\log h|}, a critical-type regime when considering ``delocalization". We derive a lower bound for the Kolmogorov-Sinai entropy of μsc\mu_{sc} that depends explicitly on ϵ\epsilon, in the spirit of that given by Ananthamaran-Koch-Nonnenmacher.

Keywords

Cite

@article{arxiv.2102.13528,
  title  = {Entropy of logarithmic modes},
  author = {Suresh Eswarathasan},
  journal= {arXiv preprint arXiv:2102.13528},
  year   = {2024}
}

Comments

Result is now general with an explicit dependence on $\epsilon$ established in the lower bound. 34 pages. All comments welcome

R2 v1 2026-06-23T23:32:51.273Z