Backreaction: Extra Dimensions

Backreaction: Extra Dimensions
This is another physics blog. This one deals with extra dimension in the String theory. Is it an interesting read? I will find out later.
I find many physics blog later. However, I have not found any interesting graduated level math blog site site.  Hopefully I will find them in the near future.
After scanning [...]

String theory and other misc musing

landscape is a good picture of the math concept of manifold. It is even better than the manifold because of the definition of that requires it acts like a flat space where calculus and coordinates can be employed.
The concept of fiber bundle of fiber is a small area and does not necessary flat for calculus [...]