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Article overview
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Convolutions with probability distributions, zeros of L-functions, and the least quadratic nonresidue | William D. Banks
; Konstantin A. Makarov
; | Date: |
7 Nov 2014 | Abstract: | Let $d$ be a probability distribution. Under certain mild conditions we show
that $$ lim_{x oinfty}xsum_{n=1}^infty
frac{d^{*n}(x)}{n}=1,qquad ext{where}quad
d^{*n}:=underbrace{,d*d*cdots*d,}_{n ext{ times}}. $$ For a compactly
supported distribution $d$, we show that if $c>0$ is a given constant and the
function $f(k):=widehat d(k)-1$ does not vanish on the line ${kin{mathbb
C}:Im,k=-c}$, where $widehat d$ is the Fourier transform of $d$, then one
has the asymptotic expansion $$
sum_{n=1}^inftyfrac{d^{*n}(x)}{n}=frac{1}{x}igg(1+sum_k m(k)
e^{-ikx}+O(e^{-c x})igg)qquad (x o +infty), $$ where the sum is taken over
those zeros $k$ of $f$ that lie in the strip ${kin{mathbb C}:-c<Im,k<0}$,
$m(k)$ is the multiplicity of any such zero, and the implied constant depends
only on $c$. For a given distribution $d$ of this type, we briefly describe the
location of the zeros $k$ of $f$ in the lower half-plane ${kin{mathbb
C}:Im,k<0}$.
For an odd prime $p$, let $n_0(p)$ be the least natural number such that
$(n|p)=-1$, where $(cdot|p)$ is the Legendre symbol. As an application of our
work on probability distributions, in this paper we generalize a well known
result of Heath-Brown concerning the behavior of the Dirichlet $L$-function
$L(s,(cdot|p))$ under the assumption that the Burgess bound $n_0(p)ll
p^{1/(4sqrt{e})+epsilon}$ cannot be improved. | Source: | arXiv, 1411.2009 | Services: | Forum | Review | PDF | Favorites |
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