Constraints on a new alternative model to dark energy

TL;DR

This paper investigates a new alternative cosmological model that modifies the Friedmann equation to explain the universe's recent acceleration and past deceleration, fitting supernova data.

Contribution

It introduces a novel model with a modified Friedmann equation that accounts for both acceleration and deceleration phases of the universe.

Findings

The model fits supernova data well.

It predicts future deceleration of the universe.

It explains recent acceleration and past deceleration.

Abstract

The recent type Ia supernova data suggest that the universe is accelerating now and decelerated in recent past. This may provide the evidence that the standard Friedmann equation needs to be modified. We analyze in detail a new model in the context of modified Friedmann equation using the supernova data published by the High-$z$ Supernova Search Team and the Supernova Cosmology Project. The new model explains recent acceleration and past deceleration. Furthermore, the new model also gives a decelerated universe in the future.