Cosmological Boundary Flux Parameter

Abstract

The {\it{Cosmological Boundary Flux Parameter}} is a novel proposal that attempts to explain the origin of the cosmological parameter $\Lambda$ purely by geometric nature. Then we implement this new approach to a flat FLRW universe along with a barotropic fluid. We present an ansatz in which $\Lambda$ is straightforwardly coupled to the matter sector; therefore, only one additional parameter was introduced: $\lambda$. Also, through a statistical analysis, using late-time data of observational Hubble and type Ia Supernovae, we computed the joint best-fit value of the free parameters by means of the affine-invariant MCMC. We want to emphasise that the joint analysis produces a smaller $H_0^{\mathrm{CBFP}}=69.80\mathrm{Km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$ in contrast to the flat $\Lambda$CDM result $H_0^{\Lambda \mathrm{CDM}}=70.53\mathrm{Km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$. The work presented here seeks to contribute to the discussion of the possible explanation for the cosmos' acceleration, together with tackling other important questions in modern cosmology.

15 pages, 6 figures

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Cited by in corpus (2)

• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• Big Bang Nucleosynthesis constraints on the cosmological evolution in a Universe with a Weylian Boundary