That time video was really fucking interesting. Completely out of my depth and I wonder how much of it is two schools arguing against each other, and how much of it is confirmable through observation and (more importantly) prediction.
If it really DOES completely sidestep the problems with dark matter (just making completely unrelated new shit up so that theory will fit observation, rather than refining previous theory)... I kinda wonder why no one is really flocking to it.
Or maybe they are, and maybe these sorts of ideas take decades to filter through the academic community.
I don't have the technical know how to tell if the guy is correct; or not, and I'm dubious on trusting anyone who has not been published and has made some serious errors in the past. However, he does reference an amazing set of Ted Talks in there based on "quantized" space time. Essentially; it's a theory that space time is not a single membrane, like most general relativity theories imagine it as. But rather, it's a bunch of little quanta of space; between which is another dimension. Essentially, it's like a ball pit (The one kids play in) except filled with bubbles matter can pass through BUT that matter still affects (Imagine if soap bubbles didn't break on contact but instead worked as a kind of high viscosity sphere.)
From what I saw, it solves a lot of questions. Gravity is explained the same way as in regular relativity, essentially the mass makes the matrix if quantum bubbles distorted, which puts pressure on the mass and creates gravity. (As far as I understood it, I could be explaining it wrong). However, it also explains why quantum particles act so oddly; because they are moving through our plank length sections of space time, into other discreet sections. They don't
reallyjust tunnel somewhere else; rather they move through the gaps in the space time bubbles, and out of our dimension. Because these gaps are so small, a larger particle, like say an atom, can't ever exist completely in one--hence why you don't see particles larger than X quantum tunneling. It also helped explain dark matter, I believe, because the bubbles naturally attempt to form an even matrix; and somehow that produces the appearance of mass due to odd gravitational distortions (Or something).
I don't know, as a layman, it could be BS; but the professors talking about it had some serious academic credentials and it certainly sounded cool. But I'm a sucker for layman space-time theories heh. Thought it was funny I saw the lecture cut up into this video though.