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It is to some extent, even though it could very well be the same as ZPE or vacuum energy.
tanka418
"dark energy" is all mysterious.
So according to Baez, a theory of quantum gravity should aspire to solve the mystery, and hopefully will give us a model that can predict the observed value. Then we might be able to say the mystery is solved, but until then, there is some mystery. Don't forget this involves one of the largest unsolved problems in physics known as the vacuum catastrophe.
People talk a lot about "vacuum energy" or "zero-point energy" - that is, the energy density of empty space. In cosmology, people also call this quantity the "cosmological constant", or "dark energy". Sometimes kooky people get really excited about the idea that if we could only use this energy somehow, all our problems would be solved. But first things first! Does this energy really exist? And if so, how much of it is there? ...
So, I've given you 5 answers to the same question:
VERY CLOSE TO ZERO
INFINITY
ENORMOUS BUT FINITE
ZERO
NOT DETERMINED
Which should you believe? I believe 1) because it is based on experiment and fairly conservative assumptions about general relativity and astronomy. Answers 2)-4) are based on somewhat naive theoretical calculations. Answer 5) is the best that quantum field theory can do right now. Reconciling answers 1) and 5) is one of the big tasks of any good theory of quantum gravity.