TL;DR
FeynGrav 4.0 introduces advanced BRST formalism, Cheung-Remmen variables, and user-friendly improvements for gravity Feynman rule computations.
Contribution
The new version implements a sophisticated BRST formalism, Cheung-Remmen variables, and usability enhancements for gravity model calculations.
Findings
Finite set of interaction rules for ghosts and gravitons.
Implementation of higher derivative gauge fixing for quadratic gravity.
Polynomials form of Einstein-Hilbert action with Feynman rules.
Abstract
We present the new version of FeynGrav, a package that provides a set of tools to work with Feynman rules for gravity models. The new version addresses two principal issues and includes changes that improve user experience. Firstly, we present a more sophisticated implementation of the BRST formalism for general relativity and quadratic gravity, which results in a finite set of interaction rules between ghosts and gravitons. We also implement a realisation of a higher derivative gauge fixing term for quadratic gravity. Secondly, we implement Feynman rules for Cheung-Remmen variables. These variables present the general relativity action in a polynomial form and produce a finite set of Feynman rules. Lastly, we introduce some minor quality-of-life changes to the package to improve the user experience.
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