The tital pretty much explains it all? Why would this be impossible or not explain everything?
Saying "dark energy is caused by virtual particles" isn't an explanation of anything. It' just a vague statement. If you take some time to look at the literature (or even at past posts in this forum), you will have a much better idea of what has already been proposed along these lines. Once you do, if you have a more specific question, please feel free to post it. But in the meantime, this thread is closed.
Separate names with a comma.