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Central limit theorems for the spectra of classes of random fractals


Authors: Philippe H. A. Charmoy, David A. Croydon and Ben M. Hambly
Journal: Trans. Amer. Math. Soc. 369 (2017), 8967-9013
MSC (2010): Primary 28A80; Secondary 60J80, 35P20
DOI: https://doi.org/10.1090/tran/7147
Published electronically: August 3, 2017
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Abstract: We discuss the spectral asymptotics of some open subsets of the real line with random fractal boundary and of a random fractal, the continuum random tree. In the case of open subsets with random fractal boundary we establish the existence of the second order term in the asymptotics almost surely and then determine when there will be a central limit theorem which captures the fluctuations around this limit. We will show examples from a class of random fractals generated from Dirichlet distributions as this is a relatively simple setting in which there are sets where there will and will not be a central limit theorem. The Brownian continuum random tree can also be viewed as a random fractal generated by a Dirichlet distribution. The first order term in the spectral asymptotics is known almost surely and here we show that there is a central limit theorem describing the fluctuations about this, though the positivity of the variance arising in the central limit theorem is left open. In both cases these fractals can be described through a general Crump-Mode-Jagers branching process and we exploit this connection to establish our central limit theorems for the higher order terms in the spectral asymptotics. Our main tool is a central limit theorem for such general branching processes which we prove under conditions which are weaker than those previously known.


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Additional Information

Philippe H. A. Charmoy
Affiliation: Mathematical Institute, Radcliffe Observatory Quarter, Oxford OX2 6GG, United Kingdom

David A. Croydon
Affiliation: Department of Statistics, University of Warwick, Coventry CV4 7AL, United Kingdom

Ben M. Hambly
Affiliation: Mathematical Institute, Radcliffe Observatory Quarter, Oxford OX2 6GG, United Kingdom

DOI: https://doi.org/10.1090/tran/7147
Received by editor(s): December 28, 2015
Received by editor(s) in revised form: December 6, 2016
Published electronically: August 3, 2017
Article copyright: © Copyright 2017 American Mathematical Society