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Photon-graviton amplitudes from the effective action |
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| Authors: | F. Bastianelli O. Corradini J. M. Dávila C. Schubert |
| Affiliation: | 1. Dipartimento di Fisica, Universit?? di Bologna and INFN, Sezione di Bologna, Via Irnerio 46, I-40126, Bologna, Italy 2. Centro de Estudios en F??sica y Matem??ticas B??sicas y Aplicadas Universidad Aut??noma de Chiapas C.P. 29000, Tuxtla Guti??rrez, M??xico 3. Instituto de F??sica y Matem??ticas Universidad Michoacana de San Nicol??s de Hidalgo Edificio C-3, Apdo. Postal 2-82 C.P. 58040, Morelia, Michoac??n, M??xico |
| Abstract: | We report on the status of an ongoing effort to calculate the complete one-loop low-energy effective actions in Einstein-Maxwell theory with a massive scalar or spinor loop, and to use them for obtaining the explicit form of the corresponding M-graviton/N-photon amplitudes. We present explicit results for the effective actions at the one-graviton four-photon level, and for the amplitudes at the one-graviton two-photon level. As expected on general grounds, these amplitudes relate in a simple way to the corresponding four-photon amplitudes. We also derive the gravitational Ward identity for the 1PI one-graviton-N photon amplitude. |
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