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Negative mass
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==In cosmology== In December 2018, astrophysicist [[Jamie Farnes]] from the [[University of Oxford]] proposed a "[[dark fluid]]" theory, related, in part, to notions of gravitationally repulsive negative masses, presented earlier by [[Albert Einstein]], that may help better understand, in a testable manner, the considerable amounts of unknown [[dark matter]] and [[dark energy]] in the [[cosmos]].<ref name="EA-20181205">{{cite web |author=University of Oxford |title=Bringing balance to the universe: New theory could explain missing 95 percent of the cosmos |url=https://www.eurekalert.org/pub_releases/2018-12/uoo-bbt120318.php |date=5 December 2018 |work=[[EurekAlert!]] |access-date=6 December 2018 |author-link=University of Oxford }}</ref><ref name="ARX-2018">{{cite journal |last=Farnes |first=J.S. |title=A Unifying Theory of Dark Energy and Dark Matter: Negative Masses and Matter Creation within a Modified ΞCDM Framework |journal=Astronomy & Astrophysics |volume=620 |pages=A92 |year=2018 |doi=10.1051/0004-6361/201832898 |bibcode=2018A&A...620A..92F |s2cid=53600834 | arxiv = 1712.07962 }}</ref>
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