Is Hubble's Expansion due to Dark Energy

TL;DR

This paper argues that dark energy is responsible not only for the universe's current acceleration but also for the original Hubble expansion, based on a mathematical similarity in acceleration formulas.

Contribution

It demonstrates that the formula for acceleration due to dark energy closely matches the Hubble law acceleration formula, linking dark energy to the universe's expansion.

Findings

Dark energy's acceleration formula resembles Hubble's law.

Dark energy likely causes both initial expansion and current acceleration.

Supports the view that dark energy underpins the universe's expansion.

Abstract

{\it The universe is expanding} is known (through Galaxy observations) since 1929 through Hubble's discovery ($V = H D$). Recently in 1999, it is found (through Supernovae observations) that the universe is not simply expanding but is accelerating too. We, however, hardly know only $4\%$ of the universe. The Wilkinson Microwave Anisotropy Probe (WMAP) satellite observational data suggest $73\%$ content of the universe in the form of dark-energy, $23\%$ in the form of non-baryonic dark-matter and the rest $4\%$ in the form of the usual baryonic matter. The acceleration of the universe is ascribed to this dark-energy with bizarre properties (repulsive-gravity). The question is that whether Hubble's expansion is just due to the shock of big-bang & inflation or it is due to the repulsive-gravity of dark-energy? Now, it is believed to be due to dark-energy, say, by re-introducing the once-discarded cosmological-constant $\Lambda$. In the present paper, it is shown that `the formula for acceleration due to dark-energy' is (almost) exactly of same-form as `the acceleration formula from the Hubble's law'. Hence, it is concluded that: yes, `indeed it is the dark-energy responsible for the Hubble's expansion too, in-addition to the current on-going acceleration of the universe'.