A new pressure-parametric cosmological model

TL;DR

This paper introduces a pressure-parametric cosmological model to explore deviations from the cosmological constant, constrains it with observational data, and reconstructs it using scalar fields, revealing future dark energy behavior.

Contribution

It proposes a novel pressure-parametric model for dark energy, constrains it with multiple datasets, and reconstructs it with scalar fields to analyze its physical implications.

Findings

Model suffers from H_0 tension.

Predicts quintessence-like acceleration in the past and present.

Dark energy density tends to increase in the future.

Abstract

We put forward a pressure-parametric model to study the tiny deviation from cosmological constant(CC) behavior of the dark sector accelerating the expansion of the Universe. Data from cosmic microwave background (CMB) anisotropies, baryonic acoustic oscillations (BAO), Type Ia supernovae (SN Ia) observation are applied to constrict the model parameters. The constraint results show that such model suffers with $H_0$ tension as well. To realize this model more physically, we reconstruct it with the quintessence and phantom scalar fields, and find out that although the model predicts a quintessence-induced acceleration of the Universe at past and present, at some moment of the future, dark energy's density have a disposition to increase.