The concept of parallel universes may help explain the finetuning of the universe for life from "summary" of Parallel Worlds by Michio Kaku
According to modern physics, the universe seems to be fine-tuned for the existence of life. This fine-tuning is so precise that even the smallest deviation in the fundamental constants of nature would result in a universe where life as we know it could not exist. Scientists have long grappled with the question of why the universe appears to be so perfectly suited for the emergence of life. One possible explanation for this fine-tuning is the existence of parallel universes. In the theory of parallel universes, or the multiverse, there are an infinite number of universes, each with its own set of physical laws and constants. In this vast cosmic landscape, the parameters that govern our universe are just one possibility among many. In the multiverse, each universe is like a bubble floating in a vast cosmic ocean. Each bubble represents a different reality, with its own unique properties and characteristics. Some universes may be devoid of any form of life, while others may be teeming with it. The fine-tuning we observe in our universe could simply be a result of the fact that we happen to inhabit one of the rare bubbles where life can flourish. If the multiverse hypothesis is correct, then the apparent fine-tuning of the universe for life becomes less mysterious. In a multiverse with an infinite number of universes, it is not surprising that we find ourselves in a universe that is conducive to the existence of life. The existence of parallel universes offers a compelling explanation for why the fundamental constants of nature seem to be so finely tuned. While the concept of parallel universes may seem far-fetched, it is rooted in the principles of modern physics. The idea of a multiverse is a natural consequence of theories like quantum mechanics and string theory, which suggest that reality is far more complex and diverse than we can imagine. By considering the possibility of parallel universes, we may come closer to understanding the enigma of the fine-tuned universe we inhabit.
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