Reconstruction of cosmic history from a simple parametrization of H

TL;DR

This paper introduces a simple parametrization of the Hubble parameter H to explain late-time cosmic acceleration, unifying various models and predicting phenomena like big rip and bounce, constrained by recent observational data.

Contribution

It proposes a unified simple parametrization of H that encompasses multiple models and demonstrates its ability to produce diverse cosmological phenomena.

Findings

The model fits well with the latest 28 H(z) data points.

It can produce phenomena such as big rip singularity and bounce.

The parametrization successfully describes transition from deceleration to acceleration.

Abstract

In this paper, we propose a simple parametrization of the Hubble parameter H in order to explain the late time cosmic acceleration. We show that our proposal covers many models obtained in different schemes of parametrization under one umbrella. We demonstrate that a simple modification in the functional form of Hubble parameter can give rise to interesting cosmological phenomena such as big rip singularity, bounce and others. We have also constrained the model parameters using the latest 28 points of H(z) data for three cases which admit transition from deceleration to acceleration.