Experimental and observational tests of antigravity
Résumé
Whereas repulsive gravity was considered as a fringe concept until the mid-1990's, the growing
experimental evidence since this epoch for repulsive gravity, in what is now called Dark Energy,
for lack of a better understanding of its nature, has led to a vast literature in order to attempt
to characterize this repulsive component, and notably its equation of state. In the following, I
will show that we can use cosmology to test the hypothesis that antimatter is at the origin of
repulsive gravity, may play the role of a Dark Energy component and, more surprisingly, may
mimic the presence of Dark Matter, and justify the MOND phenomenology. More directly,
three experiments, AEgIS, ALPHA-g and Gbar, are attempting to measure the action of
gravitation on cold atoms of antihydrogen at CERN in a near future. Finally, I note that
CP violation might be explained by antigravity and I briefly recall the motivations for this
assertion.
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