Top network posts

• 18 Is the "number of photons" of a system a Lorentz invariant?
• 14 Lie bracket for Lie algebra of $SO(n,m)$
• 13 Why mass, charge and spin are good labels for elementary particles?
• 13 Is mass an observable in Quantum Mechanics?
• 8 What goes wrong when one tries to quantize a scalar field with Fermi statistics?
• 7 Does Peskin & Schroeder Eq. (4.26), $U(t_1,t_2)U(t_2,t_3) = U(t_1,t_3)$ imply $[H_0,H_{int}] = 0$?
• 6 Does total angular momentum of the Earth-Moon system include individual rotational angular momenta?
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