So, it appears that one Dark Energy candidate may be a repulsive type of gravity. The repulsive force between matter and antimatter is predicted by General Relativity and symmetry
Antimatter gravity could explain Universe's expansion
Quote:
Ever since antimatter was discovered in 1932, scientists have been investigating whether its gravitational behavior is attractive like normal matter or repulsive. Although antimatter particles have the opposite electric charge as their associated matter particles, the masses of antimatter and matter particles are exactly equal. Most importantly, the masses are always positive. For this reason, most physicists think that the gravitational behavior of antimatter should always be attractive, as it is for matter. However, the question of whether the gravitational interaction between matter and antimatter is attractive or repulsive so far has no clear answer.
In the new study,
has shown that an answer can be found in the theory of general relativity.
Unlike previous antigravity proposals such as the idea that antimatter is gravitationally self-repulsive Villatas proposal does not require changes to well-established theories.
On the other side, the cosmological implications of this finding have shown antigravity as an alternative to (or explanation of) the wooly concept of dark energy for the accelerated expansion of the Universe.
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Entirely theoretical, but under formalised transformation rules, he's saying that mass effectively becomes negative, which reverses the gravitational atraction between matter and anti-matter.
Nice clean logic
but where's all the anti-matter to generate the expansion of the universe ? He says ''possibly in voids" .. the largest structures in the universe.
Anyway, at least he's developed a test to establish or refute the idea
at CERN.
Cheers