Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with greens-functions
Search options not deleted
user 44498
A Green's function is the impulse response of an inhomogeneous differential equation defined on a domain, with specified initial conditions or boundary conditions, thereby restricting that equation's fundamental solution. In QFT, it is essentially the propagator.
3
votes
Conditions to determine the Green's function for scattering phenomena
"My problem here is the following: to find G we need boundary conditions of the problem. I can't understand, though, what boundary conditions we should impose here.
So to solve scattering prob …
- 2,598
6
votes
How is Lippmann-Schwinger equation derived?
Most of the time, an (elastic) scattering problem can be reduced in :
An incoming initial wave / quantum state $|\phi\rangle$, which most of the time is taken to be a plane wave / free state $|\text …
- 2,598
11
votes
Accepted
How is Green function in many-body theory introduced?
Because these are actually Fourier transform of the usual Green functions.
Consider the Schrödinger equation :
$$
\hat{\mathcal{H}}|\Psi(t)\rangle=\mathrm{i}\partial_t|\Psi(t)\rangle
$$
The general so …
- 2,598
19
votes
What do the poles of a Green function mean, physically?
Let me expand a little more on what Craig Thone just said :
Consider the energy/frequency-dependent Green function :
$$
\tilde{G}(\omega)=\frac{1}{\omega-(a-\mathrm{i}b)}
$$
with one single pole in $ …
- 2,598