In an intriguing and exciting idea that extends Hugh Everett’s multiverse, physicists now propose to do away with the quantum wave function entirely, and replace it with the complex interactions of multiple parallel universes. They’re calling it the “Many Interacting Worlds” theory and suggest that what appears to be a quantum wave function is instead the outcome of subtle interactions between parallel realities. The creators of this new idea say it explains such puzzling phenomena as quantum tunneling and zero-point energy. Some are even going so far as to suggest that parallel realities communicate with one another. This new idea seems to fit perfectly with the positive results over 100 years of remote viewing experiments and practice and other heretofore unexplained phenomena.
New Scientist article on Ghost Universes (requires subscription for full view)
Original article in Physical Review X (you can read the summary here)