FIESTA5: numerical high-performance Feynman integral evaluation

Understand

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.