Scientific

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Read more about Discrete Moments
1974 reads

Limitations to equidistribution in arithmetic progressions

Speaker:

Aditi Savalia

Date:

Wed, Jul 27, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

It is well known that the prime numbers are equidistributed in arithmetic progressions. Such a phenomenon is also observed more generally for a class of arithmetic functions. A key result in this context is the Bombieri--Vinogradov theorem which establishes that the primes are equidistributed in arithmetic progressions ``on average" for moduli $q$ in the range $q\leq x^{1/2-\epsilon}$ for any $\epsilon > 0$ . Building on an idea of Maier, Friedlander--Granville showed that such equidistribution results fail if the range of the moduli $q$ is extended to $q\leq x/(\log x)^B$ for any $B>1$ . We discuss variants of this result and give some applications. This is joint work with my supervisor Akshaa Vatwani

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Quantum variance for automorphic forms

Speaker:

Bingrong Huang,

Date:

Wed, Jul 27, 2022

Location:

PIMS, University of Northern British Columbia

Conference:

Moments of L-functions Workshop

Abstract:

In this talk, I will discuss the quantum variances for families of automorphic forms on modular surfaces. The resulting quadratic forms are compared with the classical variance. The proofs depend on moments of central $L$ -values and estimates of the shifted convolution sums/non-split sums. (Based on joint work with Stephen Lester.)

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Read more about Quantum variance for automorphic forms
1640 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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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.

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Read more about The third moment of quadratic $L$ -Functions
1469 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.

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Read more about The generalised Shanks's conjecture
1617 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.

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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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Read more about Negative moments of the Riemann zeta function
1512 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.

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