The point being made here would also apply to ideas being made by Leonard Susskind's ideas relating to the holographic universe and eternal inflation. In practical terms, how can anyone prove that there is an exact copy of ourselves at the edge of our universe?
Similarly, how can anyone prove that there is a multiverse that exist aside from this one that we belong in? https://blogs.scientificamerican.com/observations/theoretical-physics-is-pointless-without-experimental-tests/ https://blogs.scientificamerican.com/observations/theoretical-physics-is-pointless-without-experimental-tests/
