In this article, we study the tensor mode equation of perturbation in the presence of nonzero-Lambda as dark energy, the dynamic nature of which depends on the Hubble parameter H and/or its time derivative. Dark energy, according to the total vacuum contribution, has a slight effect during the radiation-dominated era, but it reduces the squared amplitude of gravitational waves (GWs) up to 60% for the wavelengths that enter the horizon during the matter-dominated era.
@article{arxiv.2208.06844,
title = {Gravitational Waves with Dark Energy},
author = {J. Khodagholizadeh},
journal= {arXiv preprint arXiv:2208.06844},
year = {2022}
}