Negative mass

In theoretical physics, negative mass is a hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg.[1][2] Such matter would violate one or more energy conditions and exhibit strange properties such as the oppositely oriented acceleration for an applied force orientation. It is used in certain speculative hypothetical technologies such as time travel to the past and future,[3] construction of traversable artificial wormholes, which may also allow for time travel, Krasnikov tubes, the Alcubierre drive, and potentially other types of faster-than-light warp drives. Currently, the closest known real representative of such exotic matter is a region of negative pressure density produced by the Casimir effect.

  1. ^ Griffin, Andrew (20 April 2017). "Scientists observe liquid with 'negative mass', which turns physics completely backwards". The Independent. Archived from the original on 18 June 2022. Retrieved 11 December 2020.
  2. ^ Mortillaro, Nicole (20 April 2017). "Scientists create fluid that seems to defy physics:'Negative mass' reacts opposite to any known physical property we know". CBC News. Retrieved 11 December 2020.
  3. ^ Khanna, Gaurav (28 January 2019). "Time travel is possible – but only if you have an object with infinite mass". The Conversation. Retrieved 11 December 2020.