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NEGATIVE MASS. “So, in complete contradiction with intuition, there are only two possible behaviors: a 100% violation of the principle of equivalence, or no violation at all!” https://lnkd.in/daA2SgMy View in LinkedIn

THE PRICE OBSERVATION. “But as soon as the negative and positive masses differ even slightly in absolute value, the composite system always falls with exactly the same acceleration, respecting again the principle of equivalence: although the overall (inertial) mass of the system has decreased —it is equal to the algebraic sum of the two masses of the bound system—the trajectory of the composite system remains the same.” https://lnkd.in/daA2SgMy View in LinkedIn

LEVITATING ANTIMASS. “Richard Price noticed an extremely surprising property: whereas a negative mass falls exactly like a positive mass when it is without interactions, the bound system composed of a mass +m and a mass −m, equal and opposite, levitates and polarizes itself (Fig. 2), the negative mass lying slightly above the positive mass in the levitating system.” https://lnkd.in/daA2SgMy View in LinkedIn

TEST OF ANTIGRAVITY. “If antimatter antigravitates, then, depending on the composition of the body used to test the equivalence principle, for example beryllium and uranium, two elements with rather different binding energies, these bodies should follow different trajectories in gravitational fields.” https://lnkd.in/daA2SgMy View in LinkedIn

EARLY CONCLUSIONS. “Glashow et al. “concluded again that even if the primordial universe had succeeded in creating a symmetrical world between matter and antimatter, diffusion of matter and antimatter at their domain boundaries would lead, as soon as the Universe becomes transparent, to an annihilation between matter and antimatter in conflict with observational limits, unless the domains of matter and antimatter had a size exceeding several billion light-years, which seems unrealistic.” https://lnkd.in/daA2SgMy View in LinkedIn

INCONSISTENCY. “Indeed, if matter and antimatter have both positive gravitational masses and respect the equivalence principle, matter-antimatter annihilation continues to occur after the Universe has become transparent, leading to a diffuse high energy gamma-ray background, already difficult to justify in the early 1970s, at the epoch of the SAS-2 satellite, and clearly inconsistent with the much more sensitive contemporary satellites, such as the Fermi satellite.” https://lnkd.in/daA2SgMy View in LinkedIn

SEARCH FOR SYMMETRICAL UNIVERSE. “The conclusion of their study, after several years of effort, was that the primordial Universe, at least in the standard cosmological model, does not provide enough time for a matter-antimatter universe to create structures large enough to evade the constraints of the diffuse gamma-ray flux.” https://lnkd.in/daA2SgMy View in LinkedIn

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“THE UNIVERSE is an appearance corrected by a transparency. “ (Victor Hugo) https://lnkd.in/dNRMDkJZ View in LinkedIn

TIME TRAVEL. “And we also know since the early 1990s that building a time machine in general relativity —for example using a wormhole as a time machine— requires violating the positivity of energy. It is therefore natural to test whether antimatter is not by any chance such an “exotic” material.” https://lnkd.in/daA2SgMy View in LinkedIn