In physics, mirror matter, also called shadow matter or Alice matter, is a hypothetical counterpart to ordinary matter.[1]
https://en.wikipedia.org/wiki/Mirror_matter
In modern physics, antimatter is defined as matter composed of the antiparticles (or "partners") of the corresponding particles in "ordinary" matter. Minuscule numbers of antiparticles are generated daily at particle accelerators—total production has been only a few nanograms[1]—and in natural processes like cosmic ray collisions and some types of radioactive decay, but only a tiny fraction of these have successfully been bound together in experiments to form anti-atoms. No macroscopic amount of antimatter has ever been assembled due to the extreme cost and difficulty of production and handling.
Theoretically, a particle and its anti-particle (for example, a proton and an antiproton) have the same mass, but opposite electric charge, and other differences in quantum numbers. For example, a proton has positive charge while an antiproton has negative charge.
https://en.wikipedia.org/wiki/Antimatter
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.[1][2] 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,[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.
https://en.wikipedia.org/wiki/Negative_mass
Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe.[1] Its presence is implied in a variety of astrophysicalobservations, including gravitational effects that cannot be explained by accepted theories of gravity unless more matter is present than can be seen. For this reason, most experts think that dark matter is abundant in the universe and that it has had a strong influence on its structure and evolution. Dark matter is called dark because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect or emit electromagnetic radiation, and is therefore difficult to detect.[2]
https://en.wikipedia.org/wiki/Dark_matter
The Mirror Universe is a parallel universe in which the plots of several Star Trek television episodes take place. It resembles the fictional universe in which the Star Trek television series takes place, but is separate from the main universe.[1][2] The Mirror Universe has been visited in one episode of Star Trek: The Original Series,[3] five episodes of Star Trek: Deep Space Nine,[1][4] a two-part episode of Star Trek: Enterprise[5] and a storyline in Star Trek: Discovery, as well as several non-canon Star Trek tie-in works. It is named after "Mirror, Mirror", the original series episode in which it first appeared.[6]
https://en.wikipedia.org/wiki/Mirror_Universe
neutronium
Neutronium (sometimes shortened to neutrium,[1] also referred to as neutrite[2]) is a hypothetical substance composed purely of neutrons. The word was coined by scientist Andreas von Antropoff in 1926 (before the 1932 discovery of the neutron) for the hypothetical "element of atomic number zero" (with zero protons in its nucleus) that he placed at the head of the periodic table (denoted by dash, no element symbol).[3][4] However, the meaning of the term has changed over time, and from the last half of the 20th century onward it has been also used to refer to extremely dense substances resembling the neutron-degenerate mattertheorized to exist in the cores of neutron stars; hereinafter "degenerate neutronium" will refer to this.
Science fiction and popular literature have used the term "neutronium" to refer to an imaginary highly dense phase of matter composed primarily of neutrons, with properties useful to the story.
https://en.wikipedia.org/wiki/Neutronium
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