Number Theory

Subject:

Read more about Quantum variance for automorphic forms
1399 reads

Logging of the zeta-function, but only for a few moments!

Speaker:

Tim Trudgian

Date:

Tue, Jul 26, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

When we're between friends, we often throw in an $\epsilon$ here or there, and why not? Whether something grows like $(\log T)^{100}$ or just $T^{\epsilon}$ doesn?t often make much difference. I shall outline some current work, with Aleks Simoni\v{c}, on the error term in the fourth-moment of the Riemann zeta-function. We know that the $T^{\epsilon}$ in this problem can be replaced by a power of $\log T$ ? but which power? Tune in to find out.

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Subject:

The generalised Shanks's conjecture

Speaker:

Andrew Pearce-Crump

Date:

Mon, Jul 25, 2022 to Tue, Jul 26, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

Shanks's conjecture states that for $\rho$ a non-trivial zero of the Riemann zeta function $\zeta (s)$, we have that $\zeta ' (\rho)$ is real and positive in the mean. We show that this generalises to all order derivatives, with a natural pattern that comes from the leading order of the asymptotic result. We give an idea of the proof, and a discussion on the error term.

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Subject:

Read more about The generalised Shanks's conjecture
1338 reads

Asymptotic mean square of product of higher derivatives of the zeta-function and Dirichlet polynomials

Speaker:

Mithun Das

Date:

Tue, Jul 26, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

We discuss the asymptotic behavior of the mean square of higher derivatives of the Riemann zeta function or Hardy's $Z$-function product with a Dirichlet polynomial in a short interval. As an application, we obtain a refinement of some results by Levinson--Montgomery as well as Ki--Lee on zero density estimates of higher derivatives of the Riemann zeta function near the critical line. Also, we obtain a zero distribution result for Matsumoto--Tanigawa's $\eta_k$-function. This is joint work with S. Pujahari.

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Subject:

Lambert series of logarithm and a mean value theorem for $\zeta(\frac{1}{2}-it)\zeta'(\frac{1}{2}+it)$

Speaker:

Atul Dixit

Date:

Tue, Jul 26, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

An explicit transformation for the series $\sum_{n=1}^{\infty}d(n)\log(n)e^{-ny},$ Re$(y)>0$, which takes $y$ to~$\frac1y$, is obtained. This series transforms into a series containing $\psi_1(z)$, the derivative of~$R(z)$. The latter is a function studied by Christopher Deninger while obtaining an analogue of the famous Chowla--Selberg formula for real quadratic fields. In the course of obtaining the transformation, new important properties of $\psi_1(z)$ are derived, as is a new representation for the second derivative of the two-variable Mittag-Leffler function $E_{2, b}(z)$ evaluated at $b=1$. Our transformation readily gives the complete asymptotic expansion of $\sum_{n=1}^{\infty}d(n)\log(n)e^{-ny}$ as $y\to0$. This, in turn, gives the asymptotic expansion of $\int_{0}^{\infty}\zeta\left(\frac{1}{2}-it\right)\zeta'\left(\frac{1}{2}+it\right)e^{-\delta t}\, dt$ as $\delta\to0$. This is joint work with Soumyarup Banerjee and Shivajee Gupta.

Class:

Subject:

Negative moments of the Riemann zeta function

Speaker:

Alexandra Florea

Date:

Mon, Jul 25, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

I will talk about recent work towards a conjecture of Gonek regarding negative shifted moments of the Riemann zeta function. I will explain how to obtain asymptotic formulas when the shift in the Riemann zeta function is big enough, and how we can obtain non-trivial upper bounds for smaller shifts. This is joint work with H. Bui.

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Subject:

Read more about Negative moments of the Riemann zeta function
1272 reads

The recipe for moments of $L$-functions

Speaker:

Siegfried Baluyot

Date:

Mon, Jul 25, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

In 2005, Conrey, Farmer, Keating, Rubinstein, and Snaith formulated a `recipe' that leads to detailed conjectures for the asymptotic behavior of moments of various families of $L$-functions. In this talk, we will survey recent progress towards their conjectures and explore connections with different subjects.

Class:

Subject:

Read more about The recipe for moments of $L$-functions
1622 reads

One-level density of zeros of Dirichlet L-functions over function fields

Speaker:

Hua Lin

Date:

Mon, Jul 25, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

We compute the one-level density of zeros of order-$\ell$ Dirichlet $L$-functions over function fields $\mathbb{F}_q[t]$ for $\ell=3,4$ in the Kummer setting ($q\equiv1\pmod{\ell}$) and for $\ell=3,4,6$ in the non-Kummer setting ($q\not\equiv1\pmod{\ell}$). In each case, we obtain a main term predicted by Random Matrix Theory (RMT) and a lower order term not predicted by RMT. We also confirm the symmetry type of the family is unitary, supporting the Katz and Sarnak philosophy.

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Subject:

Selberg's central limit theorem for quadratic Dirichlet $L$-functions over function fields

Speaker:

Allysa Lumley

Date:

Mon, Jul 25, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

In this talk, we will discuss the logarithm of the central value $L\left(\frac{1}{2}, \chi_D\right)$ in the symplectic family of Dirichlet $L$-functions associated with the hyperelliptic curve of genus $g$ over a fixed finite field $\mathbb{F}_q$ in the limit as $g\to \infty$. Unconditionally, we show that the distribution of $\log \big|L\left(\frac{1}{2}, \chi_D\right)\big|$ is asymptotically bounded above by the full Gaussian distribution of mean $\frac{1}{2}\log \deg(D)$ and variance $\log \deg(D)$, and also $\log \big|L\left(\frac{1}{2}, \chi_D\right)\big|$ is at least $94.27 \%$ Gaussian distributed. Assuming a mild condition on the distribution of the low-lying zeros in this family, we obtain the full Gaussian distribution.

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Subject:

A moment with L-functions

Speaker:

Matilde Lalín

Date:

Thu, May 12, 2022

Location:

PIMS, University of British Columbia

Online

Zoom

Conference:

PIMS Network Wide Colloquium

2022 Celebration of Women in Mathematics

Abstract:

The Riemann zeta function plays a central role in our understanding of the prime numbers. In this talk we will review some of its amazing properties as well as properties of other similar functions, the Dirichlet L-functions. We will then see how the method of moments can help us in the study of L-functions and some surprising properties of their values. This talk will be accessible to advanced undergraduate students and is part of the May12, Celebration of Women in Mathematics.

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