kira is hosted by Hepforge, IPPP Durham


Feynman integral reduction program

About Kira is a Feynman integral reduction program written in C++. The reduction is performed with the help of the computer algebra system Fermat. Since version 2.0, it offers a second strategy based on finite field interpolation and reconstruction techniques with the help of the C++ library FireFly.

On this website you find precompiled and statically linked executables for different versions of Kira here. Tarballs of the source code are available here. The installation instructions can be found here or in README.rst in the tarball.

The source code is also available from a git repository at GitLab. The repository receives more frequent updates.

This webpage is still under construction.

Cite When Kira is used for a publication please cite

J. Klappert, F. Lange, P. Maierhöfer, J. Usovitsch,
Comput. Phys. Commun. 266 (2021) 108024,

P. Maierhöfer, J. Usovitsch, P. Uwer,
Comput. Phys. Commun. 230 (2018) 99,

as well as

R. H. Lewis,
Computer Algebra System Fermat,

If FireFly is used, please also cite

J. Klappert, S. Y. Klein, F. Lange,
Comput. Phys. Commun. 264 (2021) 107968,

J. Klappert, F. Lange,
Comput. Phys. Commun. 247 (2020) 106951,