空间额外维度最早是 爱因斯坦 在他的狭义相对论中发现并提出的，时间从物理上实际参与了空间性质，狭义相对论理论上是合理的，其正确性得到了实验和实践的检验。起初，爱因斯坦将时间纳入空间提出四维时空概念是以（ x , y , z , t ）为坐标的，但事与愿违的是这本质上只是个数学意义上的四维时空，而不能是个真实的物 ...
The fine-structure constant is indeed the most mysterious constant in nature. Its value depends solely on the properties of five-dimensional space as shown. The spatial geometrical properties it reveals have become a crucial step towards achieving the Grand Unification Theory ( GUT ) of ...
The current Grand Unified Theories (GUTs) is described positively in Wikipedia as the unified theory of the other three natural forces, in addition to gravity, into a single force according to particle physics. However, it is important to note that this unification is dependent on a ...
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