New holographic dark energy model inspired by the DGP braneworld

TL;DR

This paper introduces a new holographic dark energy model inspired by the DGP braneworld, showing it can explain the universe's accelerated expansion by modifying the IR cutoff to the Hubble radius, unlike standard models.

Contribution

The paper proposes a novel holographic dark energy model based on DGP braneworld entropy, demonstrating its ability to account for cosmic acceleration with the Hubble radius as IR cutoff.

Findings

Model reproduces current cosmic acceleration.

Hubble radius as IR cutoff yields non-zero equation of state.

Extra dimension effects modify holographic energy behavior.

Abstract

The energy density of the holographic dark energy is based on the area law of entropy, and thus any modification of the area law leads to a modified holographic energy density. Inspired by the entropy expression associated with the apparent horizon of a Friedmann-Robertson-Walker (FRW) Universe in DGP braneworld, we propose a new model for the holographic dark energy in the framework of DGP brane cosmology. We investigate the cosmological consequences of this new model and calculate the equation of state parameter by choosing the Hubble radius, $L = H^{-1}$, as the system's IR cutoff. Our study show that, due to the effects of the extra dimension (bulk), the identification of IR-cutoff with Hubble radius, can reproduce the present acceleration of the Universe expansion. This is in contrast to the ordinary holographic dark energy in standard cosmology which leads to the zero equation of state parameter in the case of choosing the Hubble radius as system's IR cutoff in the absence of interaction between dark matter and dark energy.