# On the photon Green functions in curved spacetime

@article{Bimonte2003OnTP, title={On the photon Green functions in curved spacetime}, author={Giuseppe Bimonte and Enrico Calloni and L. Di Fiore and Giampiero Esposito and Leopoldo Milano and Luigi Rosa}, journal={Classical and Quantum Gravity}, year={2003}, volume={21}, pages={647-659} }

Quantization of electrodynamics in curved spacetime in the Lorentz gauge and with arbitrary gauge parameter makes it necessary to study Green functions of non-minimal operators with variable coefficients. Starting from the integral representation of photon Green functions, we link them to the evaluation of integrals involving Γ-functions. Eventually, the full asymptotic expansion of the Feynman photon Green function at small values of the world function, as well as its explicit dependence on…

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