Abstract
We give results by automatic integration methods for finite and UV-divergent 4-loop diagrams and a finite 5-loop case with massless internal lines. Non-adaptive methods include DE (Double Exponential), and Quasi-Monte Carlo (QMC) techniques. The latter are based on optimal lattice rules, implemented in Cuda-C for GPUs; or, for execution on PEZY/ Exascaler, the host program is written in C++ and the kernel is generated using the Goose compiler interface. DE is executed on similar hardware as QMC, with or without parallel libraries for MPI. Transformations are incorporated to alleviate or smoothen singularities on the boundaries of the domain. For adaptive integration we use the ParInt package layered over MPI on a cluster, as well as a new adaptive scheme that performs GPU evaluations of the cubature rules. For the UV-divergent diagram we apply a nonlinear extrapolation on a sequence of integral approximations generated for dimensional regularization. Some results are verified using computationally intensive symbolic/numerical evaluations with pySecDec.
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Notes
- 1.
For those interested in English literature, “42” is the answer to the Ultimate Question of Life, the Universe and Everything, cf., Douglas Adams, “The Hitchhiker’s Guide to the Galaxy” [1].
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Acknowledgments
We acknowledge the support from the National Science Foundation under Award Number 1126438 that funded the cluster used for the computations with ParInt and ParAdapt in this paper. Furthermore we rely on the Grant-in-Aid for Scientific Research (17K05428) of JSPS, and on partial support by the Large Scale Computational Sciences with Heterogeneous Many-Core Computers, Grant-in-Aid for High Performance Computing with General Purpose Computers from MEXT (Ministry of Education, Culture, Sports, Science and Technology-Japan). We also sincerely thank the reviewers of this paper for their valuable comments.
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de Doncker, E., Yuasa, F., Olagbemi, O., Ishikawa, T. (2020). Large Scale Automatic Computations for Feynman Diagrams with up to Five Loops. In: Gervasi, O., et al. Computational Science and Its Applications – ICCSA 2020. ICCSA 2020. Lecture Notes in Computer Science(), vol 12253. Springer, Cham. https://doi.org/10.1007/978-3-030-58814-4_11
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