Review on the minimally extended varying speed of light model

Abstract

It has been known that dimensional constants such as $\hslash$, $c$, $G$, $e$, and $k$ are merely human constructs whose values and units vary depending on the chosen system of measurement. Therefore, the time variation of dimensional constants lacks operational significance due to their dependence on them. It is well-structured and represents a valid discussion. However, this fact only becomes a meaningful debate within the context of a static or present universe. As well-established theoretically and observationally, the current universe is undergoing accelerated expansion, wherein dimensional quantities, like the wavelength of light, also experience redshift phenomena elongating over cosmic time. In other words, in an expanding universe, dimensional quantities of physical parameters vary with cosmic time. From this perspective, there exists the possibility that dimensional constants, such as the speed of light, could vary with the expansion of the universe. In this review paper, we contemplate under what circumstances the speed of light may change or remain constant over cosmic time, and discuss the potential for distinguishing these cases observationally.

28 pages, 1 figure, Invited to Special Issue Feature Papers for Particles 2023

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Cited by in corpus (6)

• The minimally extended Varying Speed of Light (meVSL)
• The significance of measuring cosmological time dilation in the Dark Energy Survey Supernova Program
• Constraints on the minimally extended varying speed of light model using the Pantheon+ dataset
• 3+1 formalism of the minimally extended varying speed of light model
• Revisiting Varying Speed of Light in Cosmology: Insights from the Friedmann-Lemaître-Robertson-Walker Metric
• Perturbation Theory in the Minimally Extended Varying Speed of Light (meVSL) Model