Are there current efforts on ritz-type cosmology?

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Ritz-type cosmology, a form of variable-speed-of-light (VSL) models, proposes that physical constants may change over time or that Lorentz invariance can be locally broken. These models have been suggested to address certain cosmological anomalies effectively. Notably, they provide a derivation of the Hubble law from their foundational assumptions. The discussion raises questions about whether the Hubble law is an axiom in cosmology or if it can be derived from standard models. Current efforts in Ritz-type cosmology continue to explore these concepts and their implications for understanding the universe.
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What is the status of ritz-type cosmology?
 

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Variable-speed-of-light (VSL) cosmology models in which either (i) the physical constants vary over time or (ii) the Lorentz invariance is broken locally have been proposed before. Ritz type models, a type of VSL, seems to explain some of the cosmological anomalies. Most interestingly, the Hubble law appears to be derived from the model's assumptions. Is the Hubble law always considered an axiom or can it be derived in typical cosmological models?
 

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