Impact of the Infrared Cutoff on Structure Formation in Tsallis Holographic Dark Energy

TL;DR

This study examines how the choice of infrared cutoff affects structure formation predictions in Tsallis holographic dark energy models, finding the future event horizon yields results consistent with observations.

Contribution

It demonstrates that the viability of THDE models is highly dependent on the IR cutoff choice, with the future event horizon providing better alignment with data.

Findings

Future event horizon-based models fit observational data well.

Particle horizon models generally fail to match observed structure growth.

Growth history varies significantly with IR cutoff choice.

Abstract

We investigate the viability of Tsallis holographic dark energy (THDE) models, focusing on the role of the infrared (IR) cutoff in the growth of cosmic structures. Considering two commonly used choices of the cutoff, the particle horizon and the future event horizon, we analyze the evolution of linear matter perturbations and compute the growth factor, growth rate, and the observable $f\sigma_8(z)$. These predictions are compared with observational data from redshift-space distortion measurements. We find that the growth history is highly sensitive to the choice of IR cutoff. Models based on the future event horizon are consistent with observational data and can provide a fit comparable to, or slightly better than, the $\Lambda$CDM model for suitable values of the Tsallis parameter $\delta$. In contrast, models constructed using the particle horizon generally fail to reproduce the observed growth of structure. These results demonstrate that the viability of THDE models depends crucially on the choice of IR cutoff and highlight the importance of structure formation as a stringent test of generalized holographic dark energy scenarios.