Editing Negative mass (section)

{{Short description|Concept in physical models}}
In [[theoretical physics]], '''negative mass''' is a hypothetical type of [[exotic matter]] whose [[mass]] is of [[Negative number|opposite sign]] to the mass of [[Matter|normal matter]], e.g. −1&nbsp;kg.<ref>{{cite web|url=https://www.independent.co.uk/news/science/negative-mass-object-washington-state-physics-isaac-newton-upside-down-a7693701.html |archive-url=https://ghostarchive.org/archive/20220618/https://www.independent.co.uk/news/science/negative-mass-object-washington-state-physics-isaac-newton-upside-down-a7693701.html |archive-date=18 June 2022 |url-access=subscription |url-status=live |title=Scientists observe liquid with 'negative mass', which turns physics completely backwards |first=Andrew |last=Griffin |website=[[The Independent]] |date=2017-04-20 |access-date=2020-12-11}}</ref><ref>{{cite web|url=http://www.cbc.ca/news/technology/fluid-negative-mass-1.4073937 |title=Scientists create fluid that seems to defy physics:'Negative mass' reacts opposite to any known physical property we know |website=[[CBC News]] |date=2017-04-20 |access-date=2020-12-11 |first=Nicole |last=Mortillaro }}</ref> Such matter would violate one or more [[energy condition]]s and exhibit strange properties such as the oppositely oriented [[acceleration]] for an applied force orientation. It is used in certain [[wikt:speculative|speculative]] [[hypotheses|hypothetical]] technologies such as [[time travel]] to the past and future,<ref name="urlTime travel is possible – but only if you have an object with infinite mass">{{cite web |url=https://theconversation.com/time-travel-is-possible-but-only-if-you-have-an-object-with-infinite-mass-107063 |title=Time travel is possible – but only if you have an object with infinite mass |website=[[The Conversation (website)|The Conversation]] |date=2019-01-28 |access-date=2020-12-11 |first=Gaurav |last=Khanna }}</ref> construction of traversable [[artificial wormhole]]s, which may also allow for time travel, [[Krasnikov tube]]s, the [[Alcubierre drive]], and potentially other types of [[faster-than-light]] [[warp drive]]s. Currently, the closest known real representative of such exotic matter is a region of [[Pressure#Negative pressures|negative pressure]] density produced by the [[Casimir effect]].