onephys
  • Member for 6 years, 11 months
  • Last seen more than 4 years ago
Entropy increase vs Conservation of information (QM)
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In my humble opinion I think the answer to the question is related to the fact that for Projective Measurements the Entropy of the state always increases or stays the same. However I believe one ...

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Variation of a Lagrange density Symmetries
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Thanks for the hint. This is what I got so far: $$\delta W=\int d^4x' \mathcal{L}'(x')-\int d^4x \mathcal{L}(x)$$ Now since $d^4x'=d^4x(1+(\delta x^\alpha)_{,\alpha})$ this equation reduces to: $$\...

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