FIESTA 2: parallelizeable multiloop numerical calculations
A.V. Smirnov, V.A. Smirnov, M. Tentyukov
TL;DR
FIESTA 2 is a significantly improved, fully parallelized software tool for numerical evaluation and expansion of Feynman integrals, supporting high-precision calculations and more general parametric integrals.
Contribution
The paper introduces FIESTA 2, a rewritten version that enables parallel computation, high-precision arithmetic, and expanded capabilities for Feynman integral evaluation and expansion.
Findings
Complete parallelization across multiple computers
Support for high-precision arithmetic calculations
Enhanced ability to evaluate more general parametric integrals
Abstract
The program FIESTA has been completely rewritten. Now it can be used not only as a tool to evaluate Feynman integrals numerically, but also to expand Feynman integrals automatically in limits of momenta and masses with the use of sector decompositions and Mellin-Barnes representations. Other important improvements to the code are complete parallelization (even to multiple computers), high-precision arithmetics (allowing to calculate integrals which were undoable before), new integrators and Speer sectors as a strategy, the possibility to evaluate more general parametric integrals.
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