Searcharxiv⌕ Search

arXiv subjects

Sergei Preobrazhenskii

Publications and source records attributed to Sergei Preobrazhenskii.

7 recordsLinked to original sources

Almost all of the zeros of the Riemann zeta-function are on the critical line

This is a reworked version of the paper. An idea that allows us to circumvent limitations of previous approaches is not to apply arithmetic-geometric mean inequality and the second moment asymptotics to the entire segment $[1/2-a/\log T+iT,1/2-a/\log T+i2T]$ but use them on a subset only, and use the integral of logarithm of the mollified function on the complement. Ultimately, the result depends on the exponent in the zero-density estimate near the critical line, which leads to the relation between the magnitude of $\widetilde{V}^{1/2}$ and the measure of the exceptional set in Theorem 4, Section 2.3. The exponents of Jutila and Conrey are enough for our purposes. We provide more details on an effective approximation of $1/z$ using the Schwarz-Christoffel mapping. This is needed in the construction of the mollifier. One observation on why the approach is feasible is that the functional equation established in the paper allows one to shift the segment of integration $[1/2-a/\log T+iT,1/2-a/\log T+i2T]$ to $[1/2+A/\log T+iT,1/2+A/\log T+i2T]$. A result of Selberg allows for a proof that almost all of zeros of our integrand are to the left of the shifted segment.

math.GM↗

A note on correlations of arithmetic functions

In this note we describe weight functions that exhibit a transitional behavior between weak and strong correlation with the Liouville function. We also describe a binary problem which may be considered as an interpolation between Chowla's conjecture for two-point correlations of the Möbius function and the twin prime conjecture, in view of recent parity breaking results of K. Matomäki, M. Radziwiłł and T. Tao.

math.NT↗

A small improvement in the small gaps between consecutive zeros of the Riemann zeta-function

Feng and Wu introduced a new general coefficient sequence into Montgomery and Odlyzko's method for exhibiting irregularity in the gaps between consecutive zeros of $ζ(s)$ assuming the Riemann Hypothesis. They used a special case of their sequence to improve upon earlier results on the gaps. In this paper we consider an equivalent form of the general sequence of Feng and Wu, and introduce a somewhat less general sequence $\{a_n\}$ for which we write the Montgomery-Odlyzko expressions explicitly. As an application, we give the following slight improvement of Feng and Wu's result: infinitely often consecutive non-trivial zeros of the Riemann zeta-function differ by at most $0{.}515396$ times the average spacing.

math.NT↗

On a choice of the mollified function in the Levinson-Conrey method

Motivated by a functional property of the Riemann zeta function, we consider a new form of the mollified function in the Levinson-Conrey method. As an application, we give the following slight improvement of Feng's result: assuming Feng's condition on the lengths of the mollifier at least 41.2948% of the zeros of the Riemann zeta function are on the critical line. The construction may lead to further improvements as one increases the number of terms in Feng's mollifier.

math.NT↗

A general inversion formula for summatory arithmetic functions and its application to the summatory function of the Moebius function

We prove an inversion formula for summatory arithmetic functions. As an application, we obtain an arithmetic relationship between summatory Piltz divisor functions and a sum of the Möbius function over certain integers, denoted by $M(x,y)$. With this relationship, using bounds for the main and remainder terms in the $k$-divisor problems we deduce conditional and unconditional results concerning $M(x,y)$ and the zero-free region of the Riemann zeta-function and Dirichlet $L$-functions.

math.NT↗

An analogue of Selberg's formula for Motohashi's product

We prove an analogue of Selberg's explicit formula for Motohashi's product (see arXiv:1104.1358v3 [math.NT]). We also provide a zero-density theorem for the product, which follows from Soundararajan's theorem for moments of the Riemann zeta-function on the critical line.

math.NT↗