Integral reduction with Kira 2.0 and finite field methods

We present the new version 2.0 of the Feynman integral reduction program Kira and describe the new features. The primary new feature is the reconstruction of the final coefficients in integration by-parts reductions by means of finite field methods with the help of FireFly. This procedure can be parallelized on computer clusters with MPI. Furthermore, the support for user-provided systems of equations has been significantly improved. This mode provides the flexibility to integrate Kira into projects that employ specialized reduction formulas, direct reduction of amplitudes, or to problems involving linear system of equations not limited to relations among standard Feynman integrals. We show examples from state-of-the-art Feynman integral reduction problems and provide benchmarks of the new features, demonstrating significantly reduced main memory usage and improved performance w.r.t. previous versions of Kira. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The new version 2.0 of the Feynman integral reduction program Kira introduces new features such as reconstructing final coefficients, supporting user-provided systems of equations, and parallelization on computer clusters. Benchmark tests show significantly reduced main memory usage and improved performance compared to previous versions of Kira.