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Moments of Random Multiplicative Functions and Truncated Characteristic Polynomials

Lindqvist, Sofia Margareta
Master thesis
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URI
http://hdl.handle.net/11250/2352668
Date
2015
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  • Institutt for matematiske fag [1396]
Abstract
An asymptotic formula for the 2kth moment of a sum of multiplicative

Steinahus variables is given. This is obtained by expressing the moment

as a 2k-fold complex contour integral, from which one can extract the lead-

ing order term. The 2kth moment of a truncated characteristic polynomial of

a unitary matrix is also computed. This is done by expressing the moment as

a combinatoric sum over a restricted region, and then invoking each restric-

tion by introducing some complex integral. This gives a 2k-fold integral that

is very similar to the 2kth moment of the sum of multiplicative Steinhaus

variables, which in turn gives an asymptotic relation between the two.

Similarly, an asymptotic formula is given for the 2kth moment of a sum of

multiplicative Rademacher variables, and the 2kth moment of the truncated

characteristic polynomial of a special orthogonal matrix is found. This gives

an asymptotic relation between these two.
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NTNU

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