An interacting New Holographic Dark Energy in the framework of fractal cosmology

TL;DR

This paper investigates an interacting holographic dark energy model within fractal cosmology, demonstrating its consistency with observations, phantom behavior, and potential to avoid black hole formation, while analyzing its effects on cosmic evolution and CMB spectra.

Contribution

It introduces a new holographic dark energy model in fractal cosmology, exploring its dynamics, observational consistency, and implications for black hole avoidance and cosmic singularities.

Findings

Hubble parameter within observational range

Deceleration parameter indicates accelerating universe

Model exhibits phantom behavior and avoids black holes

Abstract

In this paper, we study an interacting holographic dark energy model in the framework of fractal cosmology. The features of fractal cosmology could pass ultraviolet divergencies and also make a better understanding of the universe in different dimensions. We discuss a fractal FRW universe filled with the dark energy and cold dark matter interacting with each other. It is observed that the Hubble parameter embraces the recent observational range while the deceleration parameter demonstrates an accelerating universe and a behavior similar to $\Lambda$CDM. Plotting the equation of state shows that it lies in phantom region for interaction mode. We use $Om$-diagnostic tool and it shows a phantom behavior of dark energy which is a condition of avoiding the formation of black holes. Finally we execute the StateFinder diagnostic pair and all the trajectories for interacting and non-interacting state of the model meet the fixed point $\Lambda$CDM at the start of the evolution. A behavior similar to Chaplygin gas also can be observed in statefinder plane. We find that new holographic dark energy model (NHDE) in fractal cosmology expressed the consistent behavior with recent observational data and can be considered as a model to avoid the formation of black holes in comparison with the main model of NHDE in the simple FRW universe. It has also been observed that for the interaction term varying with matter density, the model generates asymptotic de-Sitter solution. However, if the interaction term varies with energy density, then the model shows Big-Rip singularity. Using our modified CAMB code, we observed that the interacting model suppresses the CMB spectrum at low multipoles $l<50$ and enhances the acoustic peaks. Based on the observational data sets used in this paper and using Metropolis-Hastings method of MCMC numerical calculation, ...