Academic Journal
Brans–Dicke-like field for co-varying G and c : observational constraints.
| Τίτλος: | Brans–Dicke-like field for co-varying G and c : observational constraints. |
|---|---|
| Συγγραφείς: | Bezerra-Sobrinho, J1 (NURSE), Cuzinatto, R R2 (AUTHOR), Medeiros, L G3 (NURSE), Pompeia, P J4 (AUTHOR) |
| Πηγή: | Monthly Notices of the Royal Astronomical Society. Apr2026, Vol. 547 Issue 3, p1-16. 16p. |
| Θεματικοί όροι: | *Gravitational constant, *Physical constants, *Scalar field theory, *Cosmic background radiation, *Physical cosmology |
| Περίληψη: | A previous article by some of the authors introduced a Brans–Dicke-like framework wherein the scalar field |$\phi$| is composed of both G and c which, for this reason, co-vary according to |$c^{3}/G=\text{constant}$|. In this paper, we use observational data to constrain the supposed co-varying G and c , under the hypothesis of the validity of the standard Lemaitre formula |$1+z\sim a^{-1}$|. The data sets include SN Ia, BAO, and the value of |$\theta$| extracted from CMB data. A proxy function is demanded for the varying c since the framework does not provide a closed set of equations for computing the functional form of either G or c uniquely. Accordingly, we choose three separate parametrizations for |$c\left(z\right)$| inspired both by desirable properties of the varying speed of light (VSL) and by successful phenomenological models from the literature – including the one by Gupta (CCC framework). When combined with DESI, Pantheon+ data strongly favour a variable speed of light with more than |$3\sigma$| confidence level for all parametrizations considered in this paper, whereas Union2.1 suggests no variation of the speed of light. As we shall demonstrate, this apparent discrepancy is due to a strong correlation that emerges between |$H_0$| and VSL. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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