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If antimatter-dominated regions of space existed, the gamma rays produced in annihilation reactions along the boundary between matter and antimatter regions would be detectable. [ 28 ] Antiparticles are created everywhere in the universe where high-energy particle collisions take place.
Another possible explanation of the apparent baryon asymmetry is that matter and antimatter are essentially separated into different, widely distant regions of the universe. The formation of antimatter galaxies was originally thought to explain the baryon asymmetry, as from a distance, antimatter atoms are indistinguishable from matter atoms ...
The closest known real representative of such exotic matter is the region of pseudo ... Gravitational interaction of antimatter – Theory of gravity on antimatter;
The CPT theorem implies that the difference between the properties of a matter particle and those of its antimatter counterpart is completely described by C-inversion. Since this C-inversion does not affect gravitational mass, the CPT theorem predicts that the gravitational mass of antimatter is the same as that of ordinary matter. [5]
In particle physics, annihilation is the process that occurs when a subatomic particle collides with its respective antiparticle to produce other particles, such as an electron colliding with a positron to produce two photons. [1]
Positrons, like anti-protons, do not appear to originate from any hypothetical "antimatter" regions of the universe. On the contrary, there is no evidence of complex antimatter atomic nuclei, such as antihelium nuclei (i.e., anti-alpha particles), in cosmic rays. These are actively being searched for.
) is the antimatter counterpart of hydrogen. Whereas the common hydrogen atom is composed of an electron and proton , the antihydrogen atom is made up of a positron and antiproton . Scientists hope that studying antihydrogen may shed light on the question of why there is more matter than antimatter in the observable universe, known as the ...
A year later, after work by Weyl, the negative energy concept was abandoned and replaced by a theory of antimatter. [ 6 ] : 9 The following year, 1932, saw the discovery of the positron by Carl Anderson .