## Parallel Realities

Recent developments in theoretical physics suggest the existence of other physical realities, parallel or "alternate" universes with distinct laws of nature. A generalization of Einstein's theory of relativity, proposed by physicist Steven Weinberg, extends Einstein's equations to the case of a "cosmological constant", allowing each different possible generalization to correspond to a different universe. In string theory, physicists have considered a "multiverse" where different structures of space and time correspond to parallel universes, together comprising a nearly boundless cosmos. QCI Theory is perhaps the most expansive of all these proposals, conceiving of a metaverse composed of literally infinite constituent realities.

The fundamental reason behind the expansiveness of the QCI cosmos is the spaciousness of the complex plane, compared to the relative restrictiveness of the one-dimensional number line. By allowing quantum physics to include imaginary numbers, we greatly expand the diversity of the quantum mathematics. On the number line, there are only two directions, left and right; in the plane of imaginary numbers, there are a continuous infinity of different directions. This produces the QCI ensemble of universes.

Where are these alternate realities? Are they all around us, or a great distance away? Perhaps parallel universes are "superimposed" over each other in the same physical space, or they might exist separated by additional spatial dimensions. Can matter and energy from different universes interact? All these questions are left open by QCI Theory, which specifies only the individual characteristics and laws of physics of each universe.

The fundamental reason behind the expansiveness of the QCI cosmos is the spaciousness of the complex plane, compared to the relative restrictiveness of the one-dimensional number line. By allowing quantum physics to include imaginary numbers, we greatly expand the diversity of the quantum mathematics. On the number line, there are only two directions, left and right; in the plane of imaginary numbers, there are a continuous infinity of different directions. This produces the QCI ensemble of universes.

Where are these alternate realities? Are they all around us, or a great distance away? Perhaps parallel universes are "superimposed" over each other in the same physical space, or they might exist separated by additional spatial dimensions. Can matter and energy from different universes interact? All these questions are left open by QCI Theory, which specifies only the individual characteristics and laws of physics of each universe.