Accelerated expansion from cosmological holography

TL;DR

This paper demonstrates that holographic cosmology predicts an evolving Hubble radius, indicating dynamical dark energy and increased gravitational attraction, consistent with observed accelerated expansion and transition redshift.

Contribution

It introduces a holographic cosmology model that explains accelerated expansion with a dynamic Hubble radius and matches observational data.

Findings

Predicts an evolving Hubble radius with matter density dependence.

Reproduces the observed transition redshift of about 0.4.

Aligns with supernovae measurements of deceleration parameters.

Abstract

It is shown that holographic cosmology implies an evolving Hubble radius $c^{-1}\dot{R}_H = -1 + 3\Omega_m$ in the presence of a dimensionless matter density $\Omega_m$ scaled to the closure density $3H^2/8\pi G$, where $c$ denotes the velocity of light and $H$ and $G$ denote the Hubble parameter and Newton's constant. It reveals a dynamical dark energy and a sixfold increase in gravitational attraction to matter on the scale of the Hubble acceleration. It reproduces the transition redshift $z_t\simeq 0.4$ to the present epoch of accelerated expansion and is consistent with $(q_0,(dq/dz)_0)$ of the deceleration parameter $q(z)=q_0+(dq/dz)_0z$ observed in Type Ia supernovae.