This was my interpretation of Carroll's interpretation of the may worlds interpretation :-) I'm an avid listener to mindscape podcast and read of his books, so

This was my interpretation of Carroll's interpretation of the may worlds interpretation :-) I'm an avid listener to mindscape podcast and read of his books, so I'm likely "indoctrinated", as I don't really know much of these things. But I had the distinct impression that Carrol believes that all there is is the wave function of the universe and everything else (including the many worlds) are emergent phenomena. In a way many worlds are "real" in the same way that "chairs" are real.