Multiverse without strings

String theory has captured the imagination of physicists and the public for decades as an elegant candidate for unifying quantum mechanics and general relativity. By proposing one-dimensional strings as fundamental building blocks, string theory also requires extra spatial dimensions that could help explain the deeper workings of our universe. However, some criticism remains over string theory's lack of testability. This video essay tackles the thought-provoking question - if string theory turns out to be wrong someday, does that definitively rule out ideas of a possible multiverse or extra dimensions that we cannot perceive? Join me as I dive into various hypotheses that have been put forward about higher dimensional spaces over the past century, from Kaluza-Klein's theory to large extra dimensions proposed by Randall and Sundrum. Even without strings, exciting possibilities remain open through creative new mathematics we have yet to discover. The journey continues to unravel these cosmic mysteries. ... https://www.youtube.com/watch?v=VpfaegCgG-A