18 research outputs found
Infrared singularities in one-loop amplitudes
In this talk we discuss a purely numerical approach to next-to-leading order
calculations in QCD. We present a simple formula, which provides a local
infrared subtraction term for the integrand of a one-loop amplitude. In
addition we briefly comment on local ultraviolet subtraction terms and on the
required deformation of the contour of integration.Comment: 6 pages, talk given at the conference "Loops and Legs", Woerlitz,
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Kulturanthropologie des Textilen an der Technischen Universität Dortmund
Die Kulturanthropologie des Textilen an der Technischen Universität Dortmund präsentiert die Studiengänge Lehramt Textilgestaltung sowie Kulturanalyse und Kulturvermittlung sowie das Nebenfach Kulturanthropologie des Textilen mit Studienprojekten, Exkursionen, Auslandskooperationen, der Fachschaft und Studiensammlungen. Es vereint wissenschaftliche, didaktische und gestalterische Ansätze und Betrachtungen auf dem Feld des Vestimentären und der materiellen Kultur
Efficiency improvements for the numerical computation of NLO corrections
In this paper we discuss techniques, which lead to a significant improvement
of the efficiency of the Monte Carlo integration, when one-loop QCD amplitudes
are calculated numerically with the help of the subtraction method and contour
deformation. The techniques discussed are: holomorphic and non-holomorphic
division into sub-channels, optimisation of the integration contour,
improvement of the ultraviolet subtraction terms, importance sampling and
antithetic variates in loop momentum space, recurrence relations.Comment: 34 pages, version to be publishe
Quadratic Unconstrained Binary Optimization Approach for Incorporating Solvency Capital into Portfolio Optimization
In this paper, we consider the inclusion of the solvency capital requirement (SCR) into portfolio optimization by the use of a quadratic proxy model. The Solvency II directive requires insurance companies to calculate their SCR based on the complete loss distribution for the upcoming year. Since this task is, in general, computationally challenging for insurance companies (and therefore, not taken into account during portfolio optimization), employing more feasible proxy models provides a potential solution to this computational difficulty. Here, we present an approach that is also suitable for future applications in quantum computing. We analyze the approximability of the solvency capital ratio in a quadratic form using machine learning techniques. This allows for an easier consideration of the SCR in the classical mean-variance analysis. In addition, it allows the problem to be formulated as a quadratic unconstrained binary optimization (QUBO), which benefits from the potential speedup of quantum computing. We provide a detailed description of our model and the translation into a QUBO. Furthermore, we investigate the performance of our approach through experimental studies