A cosmology with variable c

TL;DR

This paper introduces a new variable speed of light cosmological model derived from assumptions and semi-Newtonian methods, showing a universe that begins with a Big Bang and expands forever with constant deceleration.

Contribution

It presents a novel variable-$c$ cosmological model with a distinct dynamic equation and explores its implications for universe evolution and geometry.

Findings

Universe begins from a hot Big Bang

Expands forever with constant deceleration

Estimates of age, radius, and energy content

Abstract

A new varying-$c$ cosmological model constructed using two additional assumptions, which was introduced in our previous work, is briefly reviewed and the dynamic equation of the model is derived distinctly from a semi-Newtonian approach. The results of this model, using a $\Lambda$ term and an extra energy-momentum tensor, are considered separately. It is shown that the Universe began from a hot Big Bang and expands forever with a constant deceleration parameter regardless of its curvature. Finally, the age, the radius, and the energy content of the Universe are estimated and some discussion about the type of the geometry of the Universe is provided.