“Seth material” search engine (Jane Roberts)

Antimatter exists in your own universe. You will not be able to determine its existence by any calculations aimed at discovering the existence of weight of mass. Antimatter, using your terms, exists simultaneously with your universe, having what I will call antigravity, and in what I will call anti-space.

You are indeed correct. Our negative intervals do indeed have something to do with antimatter, except that I prefer to call it negative matter. You can use whichever term you prefer.

If you will now remember that there are negative intervals, or intervals between the pulsations of energy into matter, if you will remember that your physical universe then is nonexistent for the same number of intervals that it is existent, then you will see that this gives us our antimatter.

Antimatter exists simultaneously with your own universe, and approximates it in terms of your own idea of time. [...] Because of the perilous and necessary relationship and balance between matter and antimatter, it will never be possible for you to contact the universe of antimatter.

This antimatter therefore, by inference, exists in duration on your terms for as long as your own universe of positive matter has existed. It might seem to you that the universe of antimatter is a twin of your own. [...]

[...] Your scientists have already discovered the theory of antimatter, but assume that it is completely separate from your own universe, I believe the latest theory being that a universe of antimatter may possibly be found at the furthest reaches of your known universe.

[...] You know what antimatter is. [...]

(For some material on antimatter in particular see the 60-63rd sessions.)

First, again, you have various stages of, say, pseudomatter, of dream images, that only gradually—in those terms—coalesce and become physically viable, for there are endless varieties of “matter” between the matter that you recognize and the antimatter of physicists’ theories.

[...] The same applies to negative or antimatter however, which you do not perceive in any case. [...]

[...] Even projection from your universe into a universe of antimatter is most difficult, for example. [...]

[...] There are even other physical dimensions which do not appear physical to you, your antimatter being one. [...]

[...] Or consider the positron, which is a positively charged electron, a bit of antimatter that’s said to be temporarily moving backward in time. [...]

[...] In the 63rd session, again, he deals with the two companion universes to ours, calling them a beforeimage and an afterimage, and lumping them under the general terms of negative or antimatter. [...]

[...] To its inhabitants, it is composed of physical matter, and it is just one of an infinite number of systems or universes between matter and antimatter. [...]

[...] Part of the nucleus exists in antimatter. [...]

[...] Not only are there universal systems composed of matter and antimatter, but there are an infinite variety of realities in between. [...]