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The vacuum refraction index in the presence of external fields

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Il Nuovo Cimento B (1965-1970)

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  1. R. Baier andP. Breitenlohner:Photon propagation in external fields (to be published inActa Phys. Austriaca).

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  5. This effect has been discussed extensively byJ. L. Synge (University of Toronto,Appl. Math. Ser., vol.1, 1935) as well byJ. S. Toll in his thesis. We are indebted to Prof.T. Erber for this remark.

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Baier, R., Breitenlohner, P. The vacuum refraction index in the presence of external fields. Nuovo Cimento B (1965-1970) 47, 117–120 (1967).

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