FeynGrav 3.0

We present the new version of the FeynGrav. The package provides tools to operate with Feynman rules for quantum gravity within FeynCalc. The latest version improves package efficiency and implements new physical models. We discover recurrent relations between metric factors that enhance computational efficiency. We discuss gravitational interaction with Horndeski gravity, quadratic gravity, and the simplest axion-like coupling. We implemented the massive graviton propagator and discussed the possibility of implementing massive gravity within the package.我们推出了FeynGrav的新版本。该软件包提供了在FeynCalc环境下处理量子引力费曼规则的相关工具。本次更新的版本提升了软件包的运行效率，并新增了若干物理模型的实现。我们发现了度规因子间的递推关系，进一步提升了计算效率。我们讨论了引力相互作用相关的霍恩德斯基引力（Horndeski gravity）、二次引力以及最简类轴子耦合场景。我们已实现大质量引力子传播子，并探讨了在该软件包中集成大质量引力理论的可行性。