Abstract
The family of Poisson-Dirichlet distributions is a collection of two-parameter probability distributions \(\{PD(\alpha,\theta ): 0 \leq \alpha < 1,\alpha +\theta > 0\}\) defined on the infinite-dimensional simplex. The parameters α and θ correspond to the stable and gamma component respectively. The distribution PD(α, 0) arises in the thermodynamic limit of the Gibbs measure of Derrida’s Random Energy Model (REM) in the low temperature regime. In this setting α can be written as the ratio between the temperature T and a critical temperature T c . In this paper, we study the asymptotic behaviour of PD(α, θ) as α converges to one or equivalently when the temperature approaches the critical value T c .
This work was supported by the Natural Sciences and Engineering Research Council of Canada.
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We wish to thank an anonymous referee for very helpful comments and suggestions.
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Feng, S., Zhou, Y. (2015). Asymptotic Behaviour of Poisson-Dirichlet Distribution and Random Energy Model. In: Mena, R., Pardo, J., Rivero, V., Uribe Bravo, G. (eds) XI Symposium on Probability and Stochastic Processes. Progress in Probability, vol 69. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-13984-5_7
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