But you are not observing them. Therefore they do not exist... leading to yet more theories having to do with alternate realities being shaped by each individual consciousness and how it observes the universe. And even still more theories that figure that only ones own conscious matters since...
According to some theory nothing exists until it can be observed, so until someone or something observes an alternate dimension it doesn't exist...
Other theories state, to put it in the simplest possible terms, that just *thinking* about alternate dimensions (or alternate possibilities) makes...