In my opinion, the usual way to talk about the so-called dark energy problem can be misleading for non-specialists of the subject. In the blog entry http://bit.ly/1bR3QSn, following Bianchi and Rovelli's discussion [Bianchi and Rovelli, Nature, Vol. 466, No. 7304, p. 321.], I propose to rephrase the problem as follows:

"As far as we currently know, the acceleration of the expansion of the universe is mainly due to the curvature of space-time in vacuum. Whether this curvature is due to a fundamental constant, to QFT zero energy fields or to some unknown fields that would spread everywhere, remains unknown."

Indeed, presenting the cosmic expansion this way is as simple as talking about dark energy, and actually grasps the entire possible natures of the phenomenon (at least within the general relativity paradigm).

I insist that I am only talking about "rephrasing" the problem (especially for lay people that seem to be often confused with the concept of dark energy). I do not challenge any of the research done on the subject.

Any constructive comment is warmly welcomed.

PS: see also http://bit.ly/17Qw5Mo

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