Accelerating Cosmology Driven by Gravitational Production of Dark Matter Particles: Constraints from SNe Ia and H(z) data

TL;DR

This paper explores a flat cosmological model without dark energy, where gravitationally-produced dark matter drives acceleration, and constrains its parameters using Supernovae Ia and H(z) observational data.

Contribution

It introduces a modified Einstein-de Sitter cosmology where dark matter production causes acceleration, aligning with recent Hubble and supernova measurements.

Findings

Model exhibits a transition from deceleration to acceleration at low redshift.

Successfully fits Hubble constant, supernovae, and H(z) data.

Provides an alternative explanation for cosmic acceleration without dark energy.

Abstract

The free parameters of a flat accelerating model without dark energy are constrained by using Supernovae type Ia and observational H(z) data. Instead of the vacuum dominance, the present accelerating stage in this modified Einstein-de Sitter cosmology is a consequence of the gravitationally-induced particle production of cold dark matter. The model present a transition from a decelerating to an accelerating regime at low redshifts, and is also able to harmonize a cold dark matter picture with the latest measurements of the Hubble constant H_0, the Supernovae observations (Constitution sample), and the H(z) data.