 No smooth phase transition for the nodal length of band-limited spherical random fieldsAnna Paola Todino Stochastic Processes and their Applications, 2024, vol. 169, issue C Abstract: In this paper, we investigate the variance of the nodal length for band-limited spherical random waves. When the frequency window includes a number of eigenfunctions that grows linearly, the variance of the nodal length is linear with respect to the frequency, while it is logarithmic when a single eigenfunction is considered. Then, it is natural to conjecture that there exists a smooth transition with respect to the number of eigenfunctions in the frequency window; however, we show here that the asymptotic variance is logarithmic whenever this number grows sublinearly, so that the window “shrinks”. The result is achieved by exploiting the Christoffel–Darboux formula to establish the covariance function of the field and its first and second derivatives. This allows us to compute the two-point correlation function at high frequency and then to derive the asymptotic behaviour of the variance. Keywords: Gaussian eigenfunctions; Spherical harmonics; Berry’s cancellation; Band-limited functions (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:spapps:v:169:y:2024:i:c:s0304414923002454 Ordering information: This journal article can be ordered from DOI: 10.1016/j.spa.2023.104273 Access Statistics for this article Stochastic Processes and their Applications is currently edited by T. Mikosch More articles in Stochastic Processes and their Applications from Elsevier |
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