No one, its forms when another particle in a different universe is made.
Antimatter - band - was created in 1998.
Antimatter - album - was created in 1993.
Lights Out - Antimatter album - was created in 2003.
antimatter has always been here but nobody knew about it until recently
You are giving the definition for the Big Bang Theory.
The founder of antimatter is considered to be the physicist called Paul Dirac in 1928-1930. He created a mathematical equation which predicted the existence of antiworld made out of antimatter.
Antimatter was first artificially created in 1955 at the Lawrence Berkeley National Laboratory in California by physicist Owen Chamberlain and his team. They produced the first antiproton.
A thing that not matter is antimatter. It has been created by man.
Scientists "speculate" that the Big Bang created antimatter, but it was destroyed when coming into contact with stars, planets, and other matter.
Antimatter was discovered by Paul Dirac in 1928.
Current physical theory tends to indicate there should be a symmetry expressed in the form of a parity between matter and antimatter created in the Big Bang, with no preference for matter over antimatter; this explosion should have created equal amounts of both, which would then annihilate each other. However, the universe tends to be dominated so far as we can tell by matter and no significant regions of antimatter have yet been detected. This would indicate an asymmetry or bias in favor of matter's creation, which is somewhat mysterious and remains a subject of research. In any case, this bias of matter over antimatter is believed to be extremely small - such that it may have been for every billion particles of antimatter created, there were a billion and one particles of matter.
It isn't a matter of temperature. It is created in high-speed collisions like those observed in the hadron particle collider. Antimatter is naturally occurring. It has only been created in minute amounts and costs a fortune. One kilogram of antimatter would create an explosion with the power of a 20 megaton nuclear bomb.