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2d
reviewed Approve work done for time dependent Hamiltonian
Dec
12
reviewed Approve a problem on finding acceleration by differentiation
Dec
11
reviewed Approve Why in PN junctions the octet rule is dominating electrostatic repulsion?
Dec
11
reviewed Approve Does a body curve spacetime at higher velocities?
Dec
11
reviewed Approve Is there an error in Susskinds' derivation of Euler-Lagrange equations?
Dec
4
reviewed Approve Quantum random numbers from a laser — simplest setup?
Dec
2
reviewed Approve In Ashcroft and Mermin SSP, is 18.28 wrong?
Nov
30
reviewed Approve If entropy of a closed system decreases by a certain amount, why does not the entropy of the surroundings increase by the same amount?
Nov
29
reviewed Approve Gibbs free energy intuition
Nov
29
reviewed Approve Direction of angular velocity
Nov
29
reviewed Approve Why is the Moon considered the major cause of tides, even though it is weaker than the Sun?
Nov
29
reviewed Approve Gravitational law
Nov
28
reviewed Approve Why do we use functional integration in QFT?
Nov
28
comment Does the lagrangian contain all the information about the representations of the fields in QFT?
@glance : as for the references, I've added some into the answer. As for the last question, the answer is following. Lagrangian is secondary quantity in QFT formalism, because equations of motion are obtained by using requirement of irreducibility of representation which is realizes by field. Equations of motion determine the representation uniquely. Lagrangians are constructed by the way that they must lead to the equations of motion, which determine the representation uniquely.
Nov
28
revised Does the lagrangian contain all the information about the representations of the fields in QFT?
added 380 characters in body
Nov
27
reviewed Approve SciFi Stasis Field and the Quantum Zeno Effect
Nov
26
answered Does the lagrangian contain all the information about the representations of the fields in QFT?
Nov
26
reviewed Approve What is (meant by) a non-compact $U(1)$ Lie group?
Nov
26
reviewed Approve Lever “paradox”?
Nov
24
reviewed Approve Why is less force required to open a door when we apply a force at a greater distance from the hinge?