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Chi-Variable-Speed-of-Light Cosmologies

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arxiv astro-ph/0001481 v1 pith:T2CDDW2O submitted 2000-01-27 astro-ph

Stefano Liberati (SISSA , INFN; Trieste) , Bruce A. Bassett (University of Oxford , Portsmouth University) , Carmen Molina-Paris (Los Alamos) , Matt Visser (Washington University in Saint Louis) This is my paper · ORCID
classification astro-ph
keywords cosmologiesinflationalternativeimplementationssolveaspectsattractingchi-variable-speed-of-light
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Variable-Speed-of-Light (VSL) cosmologies are currently attracting much interest as a possible alternative to cosmological inflation. We discuss the fundamental geometrodynamic aspects of VSL cosmologies, and provide several alternative implementations. These implementations provide a large class of VSL cosmologies that pass the zeroth-order consistency tests of being compatible with both classical Einstein gravity and low-energy particle physics. While they solve the ``kinematic'' puzzles as well as inflation does, VSL cosmologies typically do not solve the flatness problem since in their purest form no violation of the strong energy condition occurs. Nevertheless, these models are easy to unify with inflation.

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  1. 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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