What is Negative mass: Definition and 51 Discussions

In theoretical physics, negative mass is a type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg. Such matter would violate one or more energy conditions and show some strange properties such as the oppositely oriented acceleration for negative mass. It is used in certain speculative hypothetical technologies, such as time travel to the past, 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.

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  1. Chi Meson

    What is Negative Mass? | Status of Speculative Theory

    I remember one of the speculative ideas kicking around a while ago was the notion that mass, like charge, could be "positive" or "negative." This was different from matter and anti-matter in that "negative mass" would be made up of "negative energy." I know that negative energy can be...
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