Friday, July 20, 2018

general relativity - Are gravitational waves produced only by masses which experience a change in acceleration, and if so, is this connected to the spin 2 of the graviton?


I can't remember for sure, which is why I ask this question, but is it the case that gravitational waves are produced not by accelerated masses (like e.m. waves are produced by accelerated charges), but only by masses with a change in their acceleration?


And if so, is there a connection with the conjecture that the (hypothetical) graviton has spin 2?




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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 \...