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Asymptotic Behavior of Multiplicative Spherical Integrals and S-transform

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arxiv 2108.11842 v2 pith:HYYYCWRM submitted 2021-08-24 math.RT math.PR

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keywords integralsphericalargumentasymptoticscounterpartmultiplicativeproveresult
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abstract

In this note, we study the asymptotics of a spherical integral that is a multiplicative counterpart to the well-known Harish-Chandra Itzykson Zuber integral. This counterpart can also be expressed in terms the Heckman-Opdam hypergeometric function. When the argument of this spherical integral is of finite support and of order $N$, these asymptotics involve a modified version of the $S$-transform of the limit measure of the matrix argument and its largest eigenvalue. To prove our main result, we are leveraging a technique of successive conditionning. In particular we prove in a "mathematically rigorous" manner a result from Mergny and Potters in the case $\beta =1,2$ and we generalize it for multiple arguments

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    Fixed-length monitored Haar products converge to ν_c^⊠L; the free small-loss limit has S-transform exp(τ/(1+z)) and Erlang moments that explain Beenakker’s recursions.

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