Theoretical Limits on Agegraphic Quintessence from Weak Gravity Conjecture

TL;DR

This paper explores theoretical constraints on the agegraphic quintessence model's parameter using the weak gravity conjecture, revealing a tension with current observational bounds.

Contribution

It derives a new upper bound on the model parameter n based on fundamental physics principles, highlighting a discrepancy with observational data.

Findings

Theoretical upper bound n ≲ 2.5 conflicts with observational n between 2.637 and 2.983.

The tension suggests possible need for model revision or new physics.

Discusses implications of the discrepancy for cosmological models.

Abstract

In this paper, we investigate the possible theoretical constraint on the parameter $n$ of the agegraphic quintessence model by considering the requirement of the weak gravity conjecture that the variation of the quintessence scalar field $\phi$ should be less than the Planck mass $M_{\rm{p}}$. We obtain the theoretical upper bound $n\lesssim 2.5$ that is inconsistent with the current observational constraint result $2.637<n<2.983$ (95.4% CL). The possible implications of the tension between observational and theoretical constraint results are discussed.