Summary of main features:
This code automatically computes flows in the background field approximation within a derivative expansion, currently up to six derivatives. Some features are summarised here:
xAct based
Easy-to-use blackbox code: define the basics (field content, action, regulator, gauge-fixing), all the rest is automatic
Can treat general dimension, general gauge-fixing, arbitrary regulators including arbitrary endomorphisms, simple matter content, field redefinitions, "third ghosts"
Parallelised (custom version of xParallel)
Uses the local HK code to implement the functional trace
Developed with input from Stefan Lippoldt
Inspired by 1012.3081 but works without TT decomposition; some optimisations discussed in 2104.11336
For more information, contact Benjamin Knorr.
Publications using this code:
2104.11336 [gravitational beta functions, fourth order DE]
2109.09857 [one-loop beta functions of cubic gravity in d=6]
2204.08564 [gravity-matter beta functions with shift-symmetric scalar, minimal essential scheme, fourth order DE]
2312.03831 [gravitational beta functions, minimal essential scheme, sixth order DE]
2405.08860 [gravity-matter beta functions with Abelian gauge field, minimal essential scheme, fourth order DE]
Papers by other authors:
2305.10591 [gravitational beta functions, fourth order DE, different technical choices compared to 2104.11336]
Cross checks:
2312.03831: All flows cross-checked with independent code written by Yannick Kluth