Context: There is considerable speculation both in science and science fiction as to why the observable universe is apparently almost entirely matter, and whether other places are almost entirely antimatter instead. In the early universe, it is thought that matter and antimatter were equally represented, and the disappearance of antimatter requires an asymmetry in physical laws called the charge parity (or CP symmetry) violation. CP symmetry violation can be obtained from the Standard Model, but at this time the apparent asymmetry of matter and antimatter in the visible universe is one of the great unsolved problems in physics. Possible processes by which it came about are explored in more detail under baryogenesis.

Question: What is the disappearance of matter linked to?
Answer: Unanswerable

Question: When was there more antimatter than matter?
Answer: Unanswerable

Question: What problem has physics solved?
Answer: Unanswerable

Question: Where is the Standard Model found?
Answer: Unanswerable

Question: What field of study speculates about science fiction?
Answer: Unanswerable