Black holes that form in 'reverse Big Bang replays' could account for dark energy 

 Black hole formation could be a little Big Bang in reverse, coupling the matter of a dying star with dark energy, the mysterious force driving the accelerating expansion of the universe. 

https://cdn.mos.cms.futurecdn.net/v9wqWykaBDHZc3pARMveM6.png

https://www.space.com/dark-energy-black-hole-connection