Image: Abulic Monkey/Creative Commons
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Taken at very large scales, we would find a lot of repulsion in the universe's empty spaces, and this might be what we would otherwise think of as dark energy—the force accounting for the universe's accelerating outward expansion. It's a tantalizing thought, but we're just now getting to the stage where we can test how antimatter behaves in response to gravity; the going assumption is that it will behave just the same as regular matter, which is actually pretty reasonable. Expect confirmation either for or against the antigravity theory in the very near future, as experiments are currently underway at CERN setting "freefall limits" on trapped antihydrogen atoms.In the meantime, however, physicists can get wild. The Hajdukovic idea also accounts for dark matter, in addition to dark energy, as the virtual particles foaming through quantum vacuums will exert some massive attractive gravitational pull as well, magnifying the normal gravitational effects of objects in space. The quantum vacuum is thus attractive and repulsive in just the right ways as to account for our "dark" problems.Hajdukovic suggested that this could be tested using some very small stellar object that has an even smaller satellite traveling in an elliptical orbit. Now, the Turin researchers think they've found a suitable candidate in the dwarf planet UX25, which orbits the sun in the general region of Neptune and could be observed using current or near-current telescopes."On the assumption that particles and antiparticles forming the QV [quantum vacuum] have opposite gravitational charge, the QV energy could be compatible with that attributed to dark energy ."
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Dwarf planet UX25 seen through a telescope. Image: Wikimedia Commons/Kevin Heider
from known physics."And deviations from known physics are always just arrows toward new physics, whether they include antigravity or not.