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Experimental and observational tests of antigravity

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Abstract

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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hal-03800187 , version 1 (06-10-2022)

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Gabriel Chardin. Experimental and observational tests of antigravity. 33rd Rencontres de Blois: Exploring the Dark Universe, May 2022, Blois, France. ⟨hal-03800187⟩
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