@article{202410.2048, doi = {10.20944/preprints202410.2048.v1}, url = {https://doi.org/10.20944/preprints202410.2048.v1}, year = 2024, month = {October}, publisher = {Preprints}, author = {Kouji Nakamura}, title = {Gauge-Invariant Perturbation Theory on the Schwarzschild Background Spacetime Part II: — Even-Mode Perturbations —}, journal = {Preprints} }