Ok I been trying to figure partially exactly what things in Quantum Mechanics, Quantum Field Theory, QED, or any physics that matter gave rise to concepts of things like hyperspace and multiverse and other theories that seem to have more of a fictional history and origin than the original nonfiction physics orgin. For the most part I figured out the the concepts of paralell worlds and the multiverse is more than anything else an individual interpretation of both the meaning of probability wave function and the meaning finding an expectation value is in quantum, rather a direct consequence/assumption of string theory or quantum mechanics. Now I am trying to figure out how the general concept of multiple dimensions and hyperspace arouse as physics developed of the last 60 years. Thus I have several questions, most of which are bolded and number below, so to keep things organized. In trying to understand hyperspace, I ran into something called http://en.wikipedia.org/wiki/Quantum_foam" [Broken]. From what I read, it appears quantum foam is related to concept of vaccum energy. Ironically, I have just recently introduced to vaccum energy a few weeks ago in my Particle Physics class when the professor showed Dirac Solution to the http://en.wikipedia.org/wiki/Klein%E2%80%93Gordon_equation" [Broken]. So... 1) What exactly is the relationship between Quantum Foam and Vacuum Energy? Second I was reading some of the things about quantum foam, namely the two thread linked below: https://www.physicsforums.com/showthread.php?t=155307" https://www.physicsforums.com/showthread.php?t=68769" From them I got the sense that quantum foam is derived at least partially from the concept of combining quantum mechanics with general relativity either in loop quantum gravity, string theory, or Approximate Quantum General Relativity (*). I also came across this from wikipedia: From this I had three questions: 2) First what exactly is quantum foam's role in Loop Quantum Gravity? 3) Does quantum foam play role in String Theory? If so how? or is their something analogous to quantum foam for String Theory? 4) What exactly is wikipedia talking about in the quote above? How does the quantum foam create concept of hyperspace or even wormholes? or is hyperspace simply an interpretation of quantum foam's properties much like the concept parallel worlds is an interpretation of the wave function's properties? 5) More generally what in any Quantum Relativistic Gravity theory implies or creates the concept of a hyperspace? ______________ (*)About Approximate Quantum General Relativity. For certain special problems their are "special cases", like the two body problem, where you can create an algorithm to deal the issue with singularities and other problems by making a approximation. The mathematical form of these approximation more testable than other Quantum theories due to a mathematical similarity(**) of these "special cases" to solving problem involving BEC. I am not sure if these approximation favor String Theory or Loop Quantum Gravity more, so I left it as a separate concept.