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In the present paper, we use the optical metric for suitably defining the angle in M opt M^{\mbox{opt}} . On the other hand, Bozza and Scarpetta [ 32 ] did not take care of this matter and they used the spatial part of the spacetime metric for its simplicity
Cited in the paper.
2014
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T. Kitamura, K. Izumi, K. Nakajima, C. Hagiwara, and H. Asada, Phys. Rev. D 89
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K. Nakajima, K. Izumi, and H. Asada, Phys. Rev. D 90
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A. Ishihara, Y. Suzuki, T. Ono, T. Kitamura, and Hideki Asada, Phys. Rev. D 94
2016
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