arXiv subjects

Johannes Löffler

Publications and source records attributed to Johannes Löffler.

6 recordsLinked to original sources

arXiv2015

On self-adjointness of Poisson summation

We show that a combination of well-known operators, namely $\Iτ\circ{H}\circ\Ps$ is self-adjoint and {\em ad-hoc} related to the $ζ$ function. Here $τ$ is an involution appearing in Weil's positivity criteria needed for hermitrization, $H$ a regularization operator introduced by Connes \cite{Co2} and $\Ps$ essentially Poisson summation. We elaborate on the Hilbert-Pólya conjecture, discuss why the Hermite-Biehler theorem, uncertainty relations and cohomologies are interesting in our scenario.

math.NT↗

arXiv2015

Deformations of $Ξ(s)=Ξ(1-s)$ and the heat equation

This paper studies deformations of the well-known $Ξ(s)=Ξ(1-s)$ equation for the Riemann $Ξ$ function satisfied by $Ξ_ρ(s):=\int_{0}^\infty\frac{{\d}t}{t}{t^{\frac{s}{2}}}Ψ(t)e^{-ρ\ln^2(t)}$ where ${Ψ(t)=\sum_{n\in\mathbb{N}^+}e^{-π{n}^2t}}$.

math.NT↗

arXiv2015

Moyal-Weyl deformations of $\mathrm{DGA}$ and $\mathrm{DGCA}$

We consider a natural variant of the Moyal-Weyl product and show that it yields a functorial deformation of differential graded algebras and that we can deform coalgebras in a similar way. The Moyal-Weyl deformation of graded algebras has already been introduced by Fedosov \cite{Fe} and also appears in \cite{Ge} as part of an $A_\infty$ structure, but we are not aware that the analogous result for differential graded coalgebras already appeared in the literature and discuss the Moyal-Weyl of the category of complexes as an example.

math.QA↗

arXiv2015

On the $\mathfrak{grt}$ hexagon symmetry

In this paper we show that it is possible to project onto the solutions of the $\mathfrak{grt}$ hexagon equation. We also consider in some sense generalized hexagon equations and other symmetry equations for multiple argument maps between groups or torsors as source and show that for these equations we can construct at least some canonical solutions by symmetrization procedures. With help of this solutions we finally introduce a bunch of differentials associated to the considered symmetries.

math.QA↗

arXiv2015

Singular propagators in deformation quantization and Shoikhet-Tsygan formality

This paper adds some details to the seminal approach to logarithmic formality \cite{AWRT} and interpolation formality \cite{WR} by Alekseev, Rossi, Torossian and Willwacher: We prove that the interpolation family of Kontsevich formality maps extends to Shoikhet-Tsygan formality and a complex interpolation parameter. We show some elementary relations satisfied by this polynomials. We also compute some Kontsevich integral weights and reason on the number theoretic meaning of the invariance of Kontsevich's propagator under real translations and scalings in the case of the Merkulov $n$-wheels.

math-ph↗

arXiv2014

Some notes on Euler products

We focus on a well-known convergence phenomenon, the fact that the $ζ$ zeros are the universal singularities of certain Euler products.

math.NT↗