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Astrophysical Probes of the Constancy of the Velocity of Light

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arxiv astro-ph/9907340 v1 pith:YKTT572V submitted 1999-07-24 astro-ph gr-qchep-phhep-th

J. Ellis (CERN) , K. Farakos (NTU Athens) , N.E. Mavromatos (Oxford , CERN) , V. Mitsou (CERN , U of Athens) , D.V. Nanopoulos (Texas A , M
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HARC Academy of Athens)
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classification astro-phgr-qchep-phhep-th
keywords discussvelocityastrophysicaldatagrbslightanalysisconstancy
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We discuss possible tests of the constancy of the velocity of light using distant astrophysical sources such as gamma-ray bursters (GRBs), Active Galactic Nuclei (AGNs) and pulsars. This speculative quest may be motivated by some models of quantum fluctuations in the space-time background, and we discuss explicitly how an energy-dependent variation in photon velocity \delta c/ c \sim - E / M arises in one particular quantum-gravitational model. We then discuss how data on GRBs may be used to set limits on variations in the velocity of light, which we illustrate using BATSE and OSSE observations of the GRBs that have recently been identified optically and for which precise redshifts are available. We show how a regression analysis can be performed to look for an energy-dependent effect that should correlate with redshift. The present data yield a limit M \gsim 10^{15} GeV for the quantum gravity scale. We discuss the prospects for improving this analysis using future data, and how one might hope to distinguish any positive signal from astrophysical effects associated with the sources.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Below the Schwinger critical magnetic field value, quantum vacuum and gamma-ray bursts delay

    hep-ph 2025-01 reject novelty 3.0 of 10

    The authors claim a 2.4-hour GRB delay from a 10^6 Tesla intergalactic magnetic field, but the computation actually yields about 100 days, and the assumed field is many orders of magnitude stronger than observed.

  2. Revisiting Varying Speed of Light in Cosmology: Insights from the Friedmann-Lema\^itre-Robertson-Walker Metric

    physics.gen-ph 2025-05 reject novelty 2.0 of 10

    A varying speed of light in FLRW is presented as gauge freedom via the lapse function, but the key variational derivation omits the √-g measure and the claimed Hubble-tension resolution contradicts Eq. (30).

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