No Big Bang?

Ahmed Farag Ali and Saurya Das propose a new cosmological model.

The universe may have existed forever, according to a new model that applies quantum correction terms to complement Einstein's theory of general relativity. The model may also account for dark matter and dark energy, resolving multiple problems at once.

The Big Bang is typically described as a well established theory. But I just can't wrap my head around dark matter/dark energy--it seems too "made up". I'm in no position to judge, but the new idea somehow feels right.

Update (December 22, 2019):  I have no idea if this has anything to do with a big bang, but apparently two ways of determining the Hubble constant are producing two diverging values. It implies two greatly different age estimates for the universe and suggests a fundamental misunderstanding somewhere in the physics.