28 research outputs found
handyG– rapid numerical evaluation of generalisedpolylogarithms in Fortran
Generalised polylogarithms naturally appear in higher-order calculations of quantum field theories. We present handyG, a Fortran 90 library for the evaluation of such functions, by implementing the algorithm proposed by Vollinga and Weinzierl. This allows fast numerical evaluation of generalised polylogarithms with currently relevant weights, suitable for Monte Carlo integration
handyG -- rapid numerical evaluation of generalised polylogarithms in Fortran
Generalised polylogarithms naturally appear in higher-order calculations of
quantum field theories. We present handyG, a Fortran 90 library for the
evaluation of such functions, by implementing the algorithm proposed by
Vollinga and Weinzierl. This allows fast numerical evaluation of generalised
polylogarithms with currently relevant weights, suitable for Monte Carlo
integration.Comment: 24 pages, 3 figures, 2 listings, published version. Code is available
at https://gitlab.psi.ch/mcmule/handy
Two Loop Renormalization of Scalar Theories using a Geometric Approach
We derive a general formula for two-loop counterterms in Effective Field
Theories (EFTs) using a geometric approach. This formula allows the two-loop
results of our previous paper to be applied to a wide range of theories. The
two-loop results hold for loop graphs in EFTs where the interaction vertices
contain operators of arbitrarily high dimension, but at most two derivatives.
We also extend our previous one-loop result to include operators with an
arbitrary number of derivatives, as long as there is at most one derivative
acting on each field. The final result for the two-loop counterterms is written
in terms of geometric quantities such as the Riemann curvature tensor of the
scalar manifold and its covariant derivatives. As applications of our results,
we give the two-loop counterterms and renormalization group equations for the
O(n) EFT to dimension six, the scalar sector of the Standard Model Effective
Field Theory (SMEFT) to dimension six, and chiral perturbation theory to order
.Comment: ChPT results to O() now agree with Bijnens, Colangelo, and
Ecker, hep-ph/990733
An Algebraic Formula for Two Loop Renormalization of Scalar Quantum Field Theory
We give a general formula for the two-loop renormalization counterterms of a
scalar quantum field theory with interactions containing up to two derivatives,
which extends 't Hooft's one-loop result. We show that factorizable topologies
do not contribute to the renormalization group equations. The results will be
combined with the geometric method in a subsequent paper to obtain the
renormalization group equations for the scalar sector of effective field
theories (EFT) to two-loop order.Comment: 25 pages, 8 figure
Comparative Performance of Private and Public Healthcare Systems in Low- and Middle-Income Countries: A Systematic Review
A systematic review conducted by Sanjay Basu and colleagues reevaluates the evidence relating to comparative performance of public versus private sector healthcare delivery in low- and middle-income countries
Siegen Symposium for Geomeasurement Technology - Current and future challenges : from the four-eyes principle to AI
Die klimabedingt zu erwartende Zunahme von Extremwetterereignissen stellt die bebaute Umwelt vor erhebliche Herausforderungen und erfordert die Entwicklung geeigneter Anpassungsstrategien. Der Geomesstechnik kommt dabei eine besondere Bedeutung zu, denn verknüpft mit der mathematisch-mechanischen Modellbildung liefert sie die Grundlage für die Bewertung möglicher geomechanischer Risiken und für die daraus abzuleitenden Planungsmaßnahmen. In diesem Symposium werden die aktuellen Entwicklungen, die Möglichkeiten und Grenzen der Geomesstechnik in einem interdisziplinären und thematisch breit angelegten Kontext ausgelotet.The expected increase in extreme weather events due to climate change poses considerable challenges to the built environment and requires the development of suitable adaptation strategies. Geomeasurement technology is of particular importance in this context, because linked with mathematical-mechanical modeling it provides the basis for the assessment of possible geomechanical risks and for the planning measures to be derived from them. In this symposium, the current developments, the possibilities and limits of geomeasurement technology will be explored in an interdisciplinary and thematically broad context
handyG—Rapid numerical evaluation of generalised polylogarithms in Fortran
Generalised polylogarithms naturally appear in higher-order calculations of quantum field theories. We present handyG, a Fortran 90 library for the evaluation of such functions, by implementing the algorithm proposed by Vollinga and Weinzierl. This allows fast numerical evaluation of generalised polylogarithms with currently relevant weights, suitable for Monte Carlo integration