inflation predicts that there is. Your doppelgänger’s universe (page 126), if it exists, is a sphere of the same size centered over there, none of which we can see or have any contact with yet, because light or other information from there hasn’t had time to reach us. This is the simplest (but far from the only) example of parallel universes. I like to call this kind, a distant region of space the size of our Universe, a Level I parallel universe. All the Level I parallel universes together form the Level I multiverse.
level I universe
