"The oracular formula is known as the Feynman path integral. As far as physicists can tell, it precisely predicts the behavior of any quantum system — an electron, a light ray or even a black hole. The path integral has racked up so many successes that many physicists believe it to be a direct window into the heart of reality.

“It’s how the world really is,” said Renate Loll, a theoretical physicist at Radboud University in the Netherlands.

But the equation, although it graces the pages of thousands of physics publications, is more of a philosophy than a rigorous recipe. It suggests that our reality is a sort of blending — a sum — of all imaginable possibilities. But it does not tell researchers exactly how to carry out the sum. So physicists have spent decades developing an arsenal of approximation schemes for constructing and computing the integral for different quantum systems."

https://www.quantamagazine.org/how-our-reality-may-be-a-sum-of-all-possible-realities-20230206/?mc_cid=f0ed562e28&mc_eid=6a152ea7f5

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The #PrincipleOfLeastAction - The Closest We Have to a #TheoryOfEverything

https://www.youtube.com/watch?v=A0da8TEeaeE&ab_channel=SabineHossenfelder

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