BACK TO STRING-THEORY : ( Of Brian Greene ; Fabric of space ;
In 1919 , German mathematician named Theodor Kaluza laid out an approach to unify gravity and Electromagnetism
He proposed that the universe has one more dimension than the four space-time.......String theory is the first to merge general relativity and quantum mechanic
Calabi - Yau space for complicated class of six dimensional space.
The beauty of General Relativity is that the physics of Gravity is controlled by geometry of space.
The Fabric of cosmos may have many more dimension than we perceive directly.
The familiar motion of space-time do not extend to the sub- planckian realm
Special relativity has the constancy of speed of light.
General Relativity has the equivalence principle..
Quantum mechanic has the uncertainty principle.
String - theory has to find something analogous.