On the correctness of cosmology from quantum potential

TL;DR

This paper critically examines a quantum cosmology approach based on Bohmian trajectories, arguing it is flawed in predicting the cosmological constant and avoiding the big bang singularity due to methodological inconsistencies.

Contribution

The paper provides a detailed critique of recent quantum cosmology models using Bohmian trajectories, highlighting methodological flaws and incorrect assumptions.

Findings

Disagrees with previous claims about predicting the cosmological constant

Shows the quantum corrected Raychaudhuri equation approach is unsatisfactory

Identifies unjustified assumptions and incorrect steps in prior work

Abstract

We examine in detail the cosmology based on quantal (Bohmian) trajectories as suggested in a recent study arXiv:1404.3093[gr-qc]. We disagree with the conclusions regarding predicting the value of the cosmological constant $\Lambda$ and evading the big bang singularity. Furthermore, we show that the approach of using a quantum corrected Raychaudhuri equation (QRE), as suggested in arXiv:1404.3093[gr-qc], is unsatisfactory, because, essentially, it uses the Raychaudhuri equation, which is a kinematical equation, in order to predict dynamics. In addition, even within this inconsistent framework, the authors have adopted unjustified assumptions and carried out incorrect steps leading to doubtful conclusions.