Remarks on "The Modification of Feynman Diagrams in Curved Space-Time"

The arXiv preprint 2411.15164v1 \cite{Li:2024ltx} discusses how a weak Schwarzschild spacetime modifies Feynman diagram calculations and the governing equations of scalar and spinor particles. This short review offers an extended analysis on concerning points involving massless particles and limitations of weak-field approximation. Written for the Universität Potsdam lecture $\mathit{\text{New}}\mathit{\text{Developments}}\mathit{\text{in}}\mathit{\text{Astrophysics,}}\mathit{\text{Winter}}\mathit{\text{Semester}}\mathit{\text{2024/25}}$.