Wednesday, February 6, 2019

general relativity - Are Minkowski and Schwarzschild spacetimes diffeomorphic?


Another mathematical question, arising from GR. Some days ago I wrote, in an answer to 1, that they are. Then @magma commented they are not. He promised a proof, but none appeared. After magma's comment I have some doubts about my intuition and I would like to see a proof, in one sense or the other, or at least a reliable reference.




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...