Decrumpling or TVSD model explains why the universe is accelerating today

TL;DR

This paper demonstrates that a universe with a variable space dimension model (TVSD or decrumpling) explains the current acceleration of the universe, attributing it to a cosmological constant consistent with dark energy.

Contribution

It introduces a TVSD model that accounts for the universe's acceleration, linking it to a cosmological constant within a flat universe framework.

Findings

The universe's deceleration parameter is negative today.

The model supports a flat universe with $\,\omega(0) \approx -1$.

Acceleration is explained by the cosmological constant.

Abstract

Within the framework of a model universe with time variable space dimension (TVSD), known as decrumpling or TVSD model, we show the present value of the deceleration parameter is negative implying that the universe is accelerating today. Our study is based on a flat universe with the equation of state parameter to be $\omega(z=0) \approx -1$ today. More clearly, decrumpling model tells us the universe is accelerating today due to the cosmological constant which is the simplest candidate for the dark energy.