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HNQ
4:24 AM
2
Q: Einstein's return to aether

bedabrata-choudhurySo it seems like that Einstein returned to the concept of aether, but from the point of view of a general relativistic framework. https://mathshistory.st-andrews.ac.uk/Extras/Einstein_ether/ This is often overlooked by modern theoretical physicists. Does the introduction of this aether from a gen...

 
 
16 hours later…
HNQ
8:13 PM
2
Q: Are both of these the Dirac Hamiltonian?

Pablo T.Sometimes, I see this called the Dirac Hamiltonian: $$\hat{H} =\vec{\mathbf{\alpha}}\cdot\hat{\vec{p}} + \mathbf{\beta}m ;$$ but, if we take the Dirac Lagrangian density, obtain the corresponding Hamiltonian density via Legendre transforming and integrate, we get --- if I'm not mistaken --- $$\ha...

 

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