What if the universe had no beginning?

By | October 12, 2021

Paul Sutter writes:

In the beginning, there was … well, maybe there was no beginning. Perhaps our universe has always existed — and a new theory of quantum gravity reveals how that could work.

“Reality has so many things that most people would associate with sci-fi or even fantasy,” said Bruno Bento, a physicist who studies the nature of time at the University of Liverpool in the U.K.

In his work, he employed a new theory of quantum gravity, called causal set theory, in which space and time are broken down into discrete chunks of space-time. At some level, there’s a fundamental unit of space-time, according to this theory.

Bento and his collaborators used this causal-set approach to explore the beginning of the universe. They found that it’s possible that the universe had no beginning — that it has always existed into the infinite past and only recently evolved into what we call the Big Bang. [Continue reading…]

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