Matter is created from the slowing down of space.
This is an understanding I have from within, and on a siddhic level. This is not a slowing down of a movement in a particular direction, not quite like that. Rather space itself is a field, one that is a very balanced creation. A slight slowing down of a region of space into itself spontaneously creates matter. Each particle of matter is the nucleus of a very slightly slowed down bit of space.
Speeding up a region of space transcends the bounds of physical space itself in this finally balanced creation. Within the nucleus of any region of space which is slowed down, i.e., matter, there will be a core that relative to the slowed down region is ‘faster’, and thus a portal within it.