"If infinitely many observers throughout the universe win the lottery, on what grounds can one still claim that winning the lottery is unlikely?" theoretical physicist Raphael Bousso of the University of California, Berkeley, and colleagues write in the new study. "Normal notions of probability-where you say, Event A happens twice and Event B happens four times, so Event B is twice as likely-don't work, because instead of two and four, you have infinity," said Ken Olum of Tufts University in Massachusetts, who was not involved in the study.Īnd calculating probabilities in a multiverse wouldn't just be a problem for cosmologists. The problem with a multiverse is that anything that can happen will happen an infinite number of times, and that makes calculating probabilities-such as the odds that Earth-size planets are common-seemingly impossible. (Related: "New Proof Unknown 'Structures' Tug at Our Universe.") This vast structure is made up of an infinite number of universes, each of which can spawn an infinite number of daughter universes. The prediction comes from the theory of eternal inflation, which says our universe is part of the multiverse. Our universe has existed for nearly 14 billion years, and as far as most people are concerned, the universe should continue to exist for billions of years more.īut according to a new paper, there's one theory for the origins of the universe that predicts time itself will end in just five billion years-coincidentally, right around the time our sun is slated to die.
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