Open Access
2024 On the number of components of random polynomial lemniscates
Subhajit Ghosh
Author Affiliations +
Electron. J. Probab. 29: 1-24 (2024). DOI: 10.1214/24-EJP1147
Abstract

A lemniscate of a complex polynomial Qn of degree n is a sublevel set of its modulus, i.e., of the form {zC:|Qn(z)|<t} for some t>0. In general, the number of connected components of a unit lemniscate (i.e. for t=1) can vary anywhere between 1 and n. In this paper, we study the expected number of connected components for two models of random lemniscates. First, we show that the expected number of connected components of lemniscates whose defining polynomial has i.i.d. roots chosen uniformly from D, is bounded above and below by a constant multiple n. On the other hand, if the i.i.d. roots are chosen uniformly from S1, we show that the expected number of connected components, divided by n, converges to 12.

Subhajit Ghosh "On the number of components of random polynomial lemniscates," Electronic Journal of Probability 29(none), 1-24, (2024). https://doi.org/10.1214/24-EJP1147
Received: 2 August 2023; Accepted: 17 May 2024; Published: 2024
Vol.29 • 2024
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