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2021

Light Speed Variation in a String Theory Model for Space-Time Foam

Li, Chengyi, Ma, Bo-Qiang

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We revisit a supersymmetric string model for space-time foam, in which bosonic open-string states, such as photons, can possess quantum-gravity-induced velocity fluctuations in vacuum.

We argue that the suggestion of light speed variation with lower bound from gamma-ray burst photon time delays can serve as a support for this string-inspired framework, through connecting the experimental finding with model predictions.
We also derive the value of the effective quantum-gravity mass in this framework, and give a qualitative study on the model-dependent coefficients.
Constraints from birefringent effects and/or photon decays, including the novel $\gamma$-decay constraint obtained here from the latest Tibet AS$\gamma$ near-PeV photon, are also found to be consistent with predictions in such a quantum-gravity scheme.

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H. Xu, B.-Q. Ma, Light speed variation from gamma-ray bursts, Astropart. Phys. 82 (2016) 72, https://doi.org/10.1016/j.astropartphys.2016.05.008 , arXiv:1607.03203
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