Editing Alcubierre drive (section)

== Connection to dark energy and dark matter ==
{{see also|Negative mass|}}Astrophysicist [[Jamie Farnes]] from the [[University of Oxford]] has proposed a theory, published in the peer-reviewed scientific journal ''[[Astronomy & Astrophysics]]'', that unifies [[dark energy]] and [[dark matter]] into a single [[dark fluid]], and which is expected to be testable by the [[Square Kilometre Array]] around 2030.<ref name="EA-20181205">{{Cite web |date=5 December 2018 |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 |website=[[EurekAlert!]]}}</ref> Farnes found that [[Albert Einstein]] had explored the idea of gravitationally repulsive negative masses while developing the equations of [[general relativity]], an idea which leads to a "beautiful" hypothesis where the [[cosmos]] has equal amounts of positive and negative qualities. Farnes' theory relies on [[negative mass]]es that behave identically to the physics of the Alcubierre drive, providing a natural solution for the current "crisis in cosmology" due to a time-variable [[Hubble parameter]].<ref name="ARX-2018">{{Cite journal |last=Farnes |first=J. S. |year=2018 |title=A Unifying Theory of Dark Energy and Dark Matter: Negative Masses and Matter Creation within a Modified ΛCDM Framework |journal=Astronomy & Astrophysics |volume=620 |page=A92 |arxiv=1712.07962 |bibcode=2018A&A...620A..92F |doi=10.1051/0004-6361/201832898 |s2cid=53600834}}</ref>

As Farnes' theory allows a positive mass (i.e. a ship) to reach a speed equal to the speed of light, it has been dubbed "controversial".<ref name="BT-2019">{{Cite web |date=29 October 2019 |title=Astrophysicist claims "dark fluid" fills the missing 95% of the Universe |url=https://bigthink.com/surprising-science/astrophysicist-dark-fluid-missing-95-percent-universe |website=[[Big Think]]}}</ref> If the theory is correct, which has been highly debated in the scientific literature, it would explain dark energy, dark matter, allow [[closed timelike curve]]s (see [[time travel]]), and suggest that an Alcubierre drive is physically possible with [[exotic matter]].<ref name=":0">{{Cite journal |last=Socas-Navarro |first=H. |date=2019-05-30 |title=Can a negative-mass cosmology explain dark matter and dark energy? |journal=Astronomy & Astrophysics |volume=626 |pages=A5 |arxiv=1902.08287 |bibcode=2019A&A...626A...5S |doi=10.1051/0004-6361/201935317 |issn=0004-6361 |doi-access=free}}</ref>