Recent versions of string theory predict there are actually seven spatial dimensions beyond the three that we can sense. (discovermagazine.com)
In essence, he showed that quantum math describing physics in three spatial dimensions without gravity can be equivalent to math describing a four - dimensional space with gravity. (sciencenews.org)
One of the central ideas of string theory is that there are other spatial dimensions than the three we're used to; many string theorists imagine a world with 10 of the things. (discovermagazine.com)