Concepts of multiverse and eternal inflation are reconsidered from "summary" of Endless Universe by Paul J. Steinhardt,Neil Turok
The prevailing idea of eternal inflation posits that our universe is just one of many bubble universes that constantly pop into existence and expand. Each of these bubble universes has its own unique physical properties, determined by the initial conditions at the moment of creation. This theory suggests that the multiverse is a vast, chaotic collection of universes, each with its own laws of physics, completely disconnected from one another. However, this concept has faced criticism and is being reconsidered by some physicists. One reason for this is the lack of evidence for the existence of other universes beyond our own. If these other universes are truly disconnected from ours, there should be no way to observe or interact with them, making it impossible to confirm their existence. This lack of empirical evidence raises doubts about the validity of the multiverse theory. Another issue with the concept of eternal inflation is that it fails to explain why our universe has the specific physical properties that it does. If each bubble universe has its own set of laws ...
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