“he said that quantum physics actually implied an infinite number of near-identical parallel universes”
The multiverse is not from an “understanding of Quantum physics, but do totally to the fact that some behaviors of matter/energy at the quantum level have no explanation and zero empirical evidence for how - by what laws - they occur, but occur we know they do.
So the idiots among the tribe of theoretical physics invents things out of whole cloth to “explain” things that neither they nor anyone yet understands. ALL their fanciful notions about matter/energy at the level we reside at having the ability to demonstrate behavior only see at the quantum level have and ZERO empirical proof. Neither things like the multiverse nor string theory nor many others are more science than they are science fantasy.
Thank you.
Theorems are symbolic models. A model is not Reality.
To a theoretical mindset, an equation is more substantial than flesh and blood.
(As a math nerd in my early youth, and a science major in my later youth, I understand the seductive temptation.)
well...most of the time its done is to make the “math work out” and in the past its paid dividends! Experimental physics catches up and shows the math intuition was sound (antiparticles, neutrino, etc). Unfortunately nowadays both cosmology & particle physics are at a point where experiments are either very hard & super expensive or (mostly!) there’s no know way to do them. So you make do with the math and hope it tells you something and experimental physics finds a means to catch up. Can you be full of crap in your math jiggles most certainly!