There are also situations where theories in two or three spacetime dimensions are useful for describing phenomena in condensed matter physics Finally, there exist scenarios in which there could actually be more than four dimensions of spacetime which have nonetheless managed to escape detection.
There are also situations where theories in two or three spacetime dimensions are useful for describing phenomena in condensed matter physics. Zee 2010 Finally, there exist scenarios in which there could actually be more than four dimensions of spacetime which have nonetheless managed to escape detection.