The possibilities being discussed for dark energy range from
quantum vacuum energy to the influence of the unseen extra dimensions predicted by string theory.
Not exact matches
Strangely enough, the simplest example of
energy with repulsive gravity involves Einstein's nemesis,
quantum mechanics, which holds that even a perfect
vacuum is not empty.
Physicists struggled to ditch the ether and accept the void — until
quantum theory refilled the
vacuum with unimaginable
energy, says Paul Davies
Quantum mechanics tells us that the
vacuum of space - time is teeming with random
quantum fluctuations, which create waves of
energy.
This might have practical implications in
quantum computing, as ours is a world of constant fluctuation — even a
vacuum is alive with vibrations of
energy.
Based on particle physics alone, if we were to naively guess what the
energy density of the
vacuum ought to be, you might think it was zero; and zero was sort of acceptable to us for a long time, but the
quantum vacuum that physicists really know is not empty, so, zero was not really a very sensible answer anyway.
And empty space, as you know it, is not really empty, here is a quote about it: The physical interpretation of the cosmological constant as
vacuum energy density is supported by the existence of the «zero point»
energy predicted by
quantum mechanics.