What if the universe had no beginning?

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What if the universe had no beginning? : Read more

 

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"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."

My observation. Another approach to showing an infinite past with no beginning to the universe, using quantum gravity. Is quantum gravity as well tested and supported as the heliocentric solar system model? I note that the arXiv paper is 7 pages long and references quantum gravity nine times but zero references to testing and testable.

[2109.11953] If time had no beginning

arxiv.org

Do we know with heliocentric certainty that this new model can be accurately called a theory?