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FIESTA5: numerical high-performance Feynman integral evaluation. (English) Zbl 1522.81097

Summary: In this paper we present a new release of the FIESTA program (Feynman Integral Evaluation by a Sector decomposiTion Approach). FIESTA5 is performance-oriented – we implemented improvements of various kinds in order to make Feynman integral evaluation faster. We plugged in two new integrators, the Quasi Monte Carlo and Tensor Train. At the same time the old code of FIESTA4 was upgraded to the C++17 standard and mostly rewritten without self-made structures such as hash tables. There are also several essential improvements which are most relevant for complex integrations – the new release is capable of producing results where previously impossible.

MSC:

81Q30 Feynman integrals and graphs; applications of algebraic topology and algebraic geometry
20N05 Loops, quasigroups
81T33 Dimensional compactification in quantum field theory
08A70 Applications of universal algebra in computer science
65D30 Numerical integration
81-08 Computational methods for problems pertaining to quantum theory

Software:

FIESTA; feyntrop

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