Abstract
In a recent paper, Urban et al. [Eur. Phys. J. D 67, 58 (2013)] propose a model of the vacuum that predicts a fluctuating speed of light. Here, it is pointed out that under certain assumptions, past experiments strongly constrain the strength of such fluctuations, to a level smaller by approximately 8 orders compared with the estimate given in the paper.
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M. Urban, F. Couchot, X. Sarazin, A. Djannati-Atai, Eur. Phys. J. D 67, 58 (2013)
K. Numata, A. Kemery, J. Camp, Phys. Rev. Lett. 93, 250602 (2004)
T. Kessler et al., Nat. Photon. 6, 687 (2012)
S. Schiller, C. Lämmerzahl, H. Müller, C. Braxmaier, S. Herrmann, A. Peters, Phys. Rev. D 69, 027504 (2004)
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Schiller, S. Comment on: The quantum vacuum as the origin of the speed of light. Eur. Phys. J. D 67, 219 (2013). https://doi.org/10.1140/epjd/e2013-40290-3
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DOI: https://doi.org/10.1140/epjd/e2013-40290-3