Scientific

Subject:

Read more about Quantum variance for automorphic forms
971 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.

Class:

Subject:

The third moment of quadratic $L$-Functions

Speaker:

Ian Whitehead

Date:

Tue, Jul 26, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

I will present a smoothed asymptotic formula for the third moment of Dirichlet $L$-functions associated to real characters. Beyond the main term, which was known, the formula has an unexpected secondary term of size $x^{3/4}$ and an error of size $x^{2/3}$. I will give background on the multiple Dirichlet series techniques that motivated this result. And I will describe the new ideas about local and global multiple Dirichlet series that made the final, sieving step in the proof possible. This is joint work with Adrian Diaconu.

Class:

Subject:

Read more about The third moment of quadratic $L$-Functions
841 reads

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.

Class:

Subject:

Read more about The generalised Shanks's conjecture
878 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.

Class:

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.

Class:

Subject:

Read more about Negative moments of the Riemann zeta function
878 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
1164 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.

Class:

Subject:

Distributions of sums of the divisor function over function fields

Speaker:

Matilde Lalín

Date:

Mon, Jul 25, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

The goal of this talk is to discuss the variance of sums of the divisor function leading to certain random matrix distributions. While the knowledge of these problems is quite limited over the natural numbers, much more is known over function fields. We will start by introducing the basics of zeta functions and $L$-functions over function fields. We will then discuss the work of Keating, Rodgers, Roditty-Gershon, and Rudnick on the sums over arithmetic progressions, leading to distributions over unitary matrices by the Katz and Sarnak philosophy and a general conjecture over the natural numbers. Finally, we will present some recent work (in collaboration with Kuperberg) on sums over squares modulo a prime leading to symplectic distributions.

Class:

Subject: