Where Is The Multiverse?

The Technic History hyperdrive quantum jumps between thousands of closely adjacent points in space per second but does not traverse the short distances between those points and therefore is not bound by the relativistic light speed limit. In Poul Anderson's "Margin of Profit," van Rijn's ship, Mercury, and the Borthudian frigate, Gantok, pulse in and out of space with different frequencies with the result that missiles from Gantok pass harmlessly through the volume of space occupied by Mercury and her crew, including van Rijn himself. Later in the Technic History, Dominic Flandry's ship interpenetrates the space occupied by an enemy vessel and Flandry momentarily glimpses his personal antagonist on the bridge of his ship. 

On this hypothesis, only objects on hyperdrive oscillate. However, an extension of this idea would be that everything oscillates on a level below the level of perception. Subjects and objects of consciousness oscillate at the same frequency so that no one notices objects momentarily disappearing and reappearing. Entire universes would be able to occupy the same space while oscillating at different frequencies and an individual would be able to travel between universes - disappear from one and appear in another - simply by changing his rate of vibration. This was the basis of one superhero multiverse.

In another kind of multiverse, each universe splits every time a random event occurs or a choice is made. Each such universe has three spatial dimensions and one temporal dimension and they coexist in a fifth dimension. Alternatively, they have always coexisted in parallel with each other and they only appear to split when their histories diverge noticeably. Valeria Matuchek gives this second account in Anderson's A Midsummer Tempest.

My point is that these are two kinds of multiverses. Maybe both exist?