Comment on: The quantum vacuum as the origin of the speed of light
Institut für Experimentalphysik,
Heinrich-Heine-Universität Düsseldorf, 40225
a e-mail: email@example.com
Published online: 1 November 2013
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.
Key words: Quantum Optics
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013