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2d
answered Question about the apparent loophole in principle of least action
Apr
28
answered Time-ordered product of two normal-ordered products of fields
Apr
27
answered General form for functional derivatives
Apr
27
answered Are the path integral formalism and the operator formalism inequivalent?
Apr
26
answered Tricky operator identity: $[L^2,[L^2,\vec{r}]]=2 \hbar ^2 \{ L^2, \vec{r}\}$?
Apr
26
answered How do we know the Schwarzschild solution contains an object of mass $M$?
Apr
25
answered Is the electric field of a volume charge distribution well defined?
Apr
25
answered What are the assumptions behind the Lagrangian derivation of energy?
Apr
23
answered Hamiltonian or free energy corresponding to 2+1D Kuramoto-Sivashinsky model
Apr
23
answered How do derivative couplings affect canonical quantization?
Apr
22
answered Why don't people use Hamilton's equations for a relativistic free charged particle?
Apr
22
answered Spherical Shell with Electric Field Zero Everywhere Inside It
Apr
21
answered What is the origin of the Dirac delta term in the dipole electric field?
Apr
20
answered Higher than Lagrangian/action?
Apr
20
answered SHO in QM and Klein Gordon field in 1+0D QFT
Apr
16
answered Why is the covariant derivative of the determinant of the metric zero?
Apr
14
answered Hamiltonian from a differential equation
Apr
13
answered Use partial or covariant derivatives when deriving equations of a field theory?
Apr
12
answered Quantum computing entanglement dimensions question
Apr
11
answered How can $\Lambda^0$ and $\Sigma^0$ both have $uds$ quark content?