Abstract
We investigate the possible variation of c in the context of the present accelerating Universe as discovered through SN Ia observations and show that variability of c is not permitted under the variable Λ models.
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Ghosh, P.P., Mukhopadhyay, U. & Ray, S. Does accelerating Universe permit varying speed of light?. Astrophys Space Sci 337, 509–510 (2012). https://doi.org/10.1007/s10509-011-0885-5
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DOI: https://doi.org/10.1007/s10509-011-0885-5