Numerical evaluation of multi-loop integrals

We present updates on the development of pySecDec, a toolbox to numerically evaluate parameter integrals in the context of dimensional regularization. We discuss difficulties with loop integrals in the special kinematic condition where the squared momentum of a leg is equal to the squared mass of a propagator. We further discuss some features of a Quasi Monte Carlo (QMC) integrator that can optionally run on Graphics Processing Units (GPUs).Comment: 10 pages, 5 figures, contribution to the proceedings of Loops and Legs 2018, St. Goar, German

E-Commerce mit ökologischen Produkten. [E-commerce with products from organic agriculture]

Nach wie vor stehen Landwirte und der nachfolgende Handel vor Entscheidungen, die darüber bestimmen, auf welche Art und Weise das Internet in die Unternehmenskonzeption integriert bzw. der Einsatz weiterentwickelt wird. Die vorliegende empirisch gestützte Studie stellt drei Schwerpunkte in den Mittelpunkt der Betrachtungen: Die Eignung landwirtschaftlicher Produkte zum Online-Handel, den Erfolg unterschiedlicher elektronischer Handelsformen in der Landwirtschaft und Einflussfaktoren auf den E-Commerce mit ökologischen Produkten. Am Ende stehen Kriterien und Empfehlungen, nach denen man sich bei einer Integration und Weiterentwicklung der Online-Handelsaktivitäten richten kann. Marktchancen sollen damit erkannt und genutzt werden und Marketingstrategien darauf aufbauen können

Successive Radii and Ball Operators in Generalized Minkowski Spaces

We investigate elementary properties of successive radii in generalized Minkowski spaces (that is, with respect to gauges), i.e., we measure the "size" of a given convex set in a finite-dimensional real vector space with respect to another convex set. This is done via formulating some kind of minimal containment problems, where intersections or Minkowski sums of the latter set and affine flats of a certain dimension are incorporated. Since this is strongly related to minimax location problems and to the notions of diametrical completeness and constant width, we also have a look at ball intersections and ball hulls.Comment: submitted to "Advances of Geometry

Barbarian thoughts: Imperialism in the philosophy of John Stuart Mill

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IR and the state of nature: the cultural origins of a ruling ideology

This article argues that the modern concept of the state of nature as the defining claim of IR theory was developed in the course of the intercultural/international encounter between the Spaniards and the Amerindian peoples after the discovery of America. The analysis of the Spanish debate at the time demonstrates that the concept of the state of nature was itself the product of a highly charged moral discourse. Its continuous and unreflected use in the discipline of International Relations, where it supposedly describes a precultural, presocial, premoral condition between states, therefore hides the cultural, social and moral meanings the concept carries with it and suppresses a normative discourse of International Relations past and present