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Jan
29
revised Kronecker sum or direct sum?
added 15 characters in body
Jan
26
answered How to calculate the effective action in general?
Jan
25
comment Quantum Anomalies and Quantum Symmetries
Unless the action is not analytic, then there is a contraction. Maybe you could write your proof as an answer, and we could see if it makes sense or not.
Jan
25
answered Kronecker sum or direct sum?
Jan
21
comment Asymptotic behaviour of the propagator for a scalar field
@AlexV.: Note that my argument just developped enough to find the leading exponential term. There will also be prefactors, dependent on $t$, which will imply the "damping" of the $e^{-i mt}$ oscillations, that you can obtain if you compute the gaussian correction to the saddle-point expansion. You can get the correct form of the prefactor here : en.wikipedia.org/wiki/Bessel_function#Asymptotic_forms
Jan
19
answered Asymptotic behaviour of the propagator for a scalar field
Jan
19
revised If a system is in a state $L^2 =2 \hbar^2$ and $L_x=0$ why can't $L_z$ be 0?
added 2 characters in body
Jan
19
answered If a system is in a state $L^2 =2 \hbar^2$ and $L_x=0$ why can't $L_z$ be 0?
Jan
5
answered Radial quantum number for infinite circular well
Jan
5
revised Difference between DMRG (density matrix renomalization group) and MPS (matrix product states)?
added 12 characters in body
Jan
5
comment Difference between DMRG (density matrix renomalization group) and MPS (matrix product states)?
@NorbertSchuch: Ok, I wasn't sure if there was any proof that it is the optimal method. I'll change that by "one of the best method we have" then. Thanks.
Jan
5
comment Difference between DMRG (density matrix renomalization group) and MPS (matrix product states)?
@NorbertSchuch That's what I heard. But you are for sure the expert around here, and if my statement is wrong, I would happily modify my answer.
Dec
3
answered Difference between DMRG (density matrix renomalization group) and MPS (matrix product states)?
Dec
1
answered Determinant of a propagator
Nov
8
comment How do we know for sure a theory is non-renormalizable?
@JiaYiyang: this is only true at a perturbative level.
Nov
7
awarded  Nice Answer
Nov
6
answered Trace representation of density matrix question
Nov
4
comment QFT with fixed boundary conditions
@user2309840: that's a good point. If you have a nice reference for the Casimir effect, I would love to have it.
Nov
4
asked QFT with fixed boundary conditions
Nov
3
revised Fourier transform for $W(J)$ in a free QFT
edited body