Is there any specific reason to know why exactly space curves due to a mass. enstien stated that intensity of energy in space will curve the space want to know why so _ just an example let say - Why did apple fell down to earth _ Because there is some sort of force , but just like in a same way why space curves due to mass . I know why word never end in physics but at least it should end at some meaningful point.
Answer
Good question!
Nobody knows! Einstein postulated that $Curvature \propto StressEnergy$. (Energy and mass related by $E=mc^2$). And that seems to work out great. It fits experiment (so far...). It also obeys his law of coordinate invariance which says it shouldn't matter how you label points in space-time. (But so do other equations, for example you might want to add a $Curvature^2$ term.)
As for why... people are still trying to work out! Some people say it might be to do with graviton particles, some people with loops, some with strings, some with causal sets. But truth be told, nobody has solved this problem yet!
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