Thomas Hertog's Multiverse Cosmology

There were a bunch of questions that were engendered by the recent podcast we had with Thomas Hertog. Bruno Tashira says, I'm not sure I was able to understand Thomas Hertog's quantum cosmology. Rad Antonov: Can he say that at the largest scales, the correct theory is one that calculates probability amplitudes just like quantum mechanics does at the microscopic scale? David Wallace in his former mindscape guest in his book, the emergent multiverse talks about a picture where what happens is you make a quantum measurement at some point in spacetime and then there are two branches outside your light cone.