They hope that their work can help the wider scientific community figure out how dark energy is accelerating the expansion of the universeControversial and unpopular thought... but maybe, just maybe, relying on something that cannot be seen or detected to fill in the gaps to make models work might mean that there are more fundamental issues with the models themselves?
I am not a physicist or astronomer but Occams Razor? Whenever other models have been found to be lacking it's been the model that has been at fault and adding hypothetical things to a model to bludgeon it into mostly working just doesn't feel right.