Constraints on Dark Energy Models from Weak Gravity Conjecture

TL;DR

This paper investigates how the weak gravity conjecture constrains dark energy models, finding that observational data combined with theoretical principles restrict the equation of state parameter and challenge certain holographic models.

Contribution

It applies the weak gravity conjecture to dark energy models and combines it with observational data to derive new constraints on model parameters.

Findings

Dark energy equation of state parameter w < -0.7 at 3σ confidence

Holographic dark energy model with scalar field is in the swampland

Constraints tighten the viability of certain dark energy models

Abstract

We study the constraints on the dark energy model with constant equation of state parameter $w=p/\rho$ and the holographic dark energy model by using the weak gravity conjecture. The combination of weak gravity conjecture and the observational data gives $w<-0.7$ at the $3\sigma$ confidence level. The holographic dark energy model realized by a scalar field is in swampland.