Saturday, November 24, 2018

general relativity - Is the description of the gravitational field as a vector field and a tensor field compatible?


By electric or magnetic fields we mean the vector fields E(r,t) and B(r,t) respectively. But a gravitational field in Newtonian theory is a vector field that g(r) that obeys ×g=0 and g=4πGρm. But in Einstein's theory we describe gravity as a tensor field gμν(x). How are these two descriptions of gravity, one in terms of the vector field g(r) and in other in terms of the tensor field gμν(x), compatible with each other in terms of the number of degrees of freedom? Thanks!





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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 \...