3 ms·
For charge product q1q2 > 0 : even integer spin attractive q1q2 > 0 : odd integer spin repulsive Jumping up classically, for a vector field like charges repe
by raattgift 8y ago
For charge product
q1q2 > 0 : even integer spin attractive
q1q2 > 0 : odd integer spin repulsive
Jumping up classically, for a vector field like charges repel. For a (symmetric) rank-2 tensor field like charges attract.
The weak equivalence principle only requires m_i = m_g up to the sign of the latter. It's the energy conditions which constrain that, notably the WEC component of the positive energy theorem.
- pdonis 8y ago> For a (symmetric) rank-2 tensor field like charges attract. For a spin-2 field all charges attract. There is no such thing as "unlike charges". > The weak equivalence principle only requires m_i = m_g up to the sign of the latter. I don't know where you're getting that from. The WEP requires that the trajectory of a body moving solely under gravity depends solely on its initial position and velocity. That means m_i = m_g. It does not allow flipping the sign; that would mean there would be two possible trajectories for a given initial position and velocity, not one.
- pdonis 8y ago> For charge product q1q2 > 0 : even integer spin attractive q1q2 > 0 : odd integer spin repulsive Yes, I see I misread your previous post; for spin-1 unlike charges attract and like charges repel. That I agree with.