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 many-body
Search options not deleted
user 36793
Many body covers questions about systems consisting of a great number of particles and techniques used to tackle them.
1
vote
1
answer
138
views
Attempt to define a momentum space wavefunction for a superposition of of 1-particle states
Consider an arbitrary state in the Fock space constructed by superposing 1-particle states: $$|\psi\rangle=\mathbb{1}|\psi\rangle=\int\frac{d^3\textbf{p}}{(2\pi)^32E_p}|p\rangle\langle p|\psi\rangle$$ …
- 27.2k
4
votes
Accepted
How is particle creation (or annihilation) possible in non-relativistic many body physics?
Can we have particle creation or annihilation in non-relativistic physics?
The answer is an emphatic yes. It is quite a routine in non-relativistic (NR) many-body physics.
How is particle c …
- 27.2k
1
vote
2
answers
801
views
How is particle creation (or annihilation) possible in non-relativistic many body physics?
How is that, in many-body physics, particle creation and annihilations are possible even though it is a non-relativistic theory?
- 27.2k
2
votes
2
answers
707
views
Statistical mechanics vs. many-body theory
Where is the basic difference of statistical mechanics with many-body physics? What are the systems which cannot be studied in statistical mechanics but in many body theory? After all we know interact …
- 27.2k
13
votes
4
answers
1k
views
Why don't we have a "Cooper pair" of two holes in a superconductor?
The condensate of Cooper pairs is described by a complex scalar field (or the order parameter) which, when quantized can give rise (or is capable of creating) two types of quanta with charges opposite …
- 27.2k
5
votes
2
answers
2k
views
Why does the free electron theory of metals work?
Free electron theory of metals works unreasonably well in spite of the fact that we neglect the Coulomb repulsion between the electrons. Is there deeper reason why this should work? Somewhere I heard …
- 27.2k
3
votes
0
answers
612
views
Density of states for a system of $N$ particles (both interacting and non-interacting case)
The density of states $\rho(\epsilon)$ for a single particle (with $g$ number of internal states such as spin) confined in a volume $V$ can be calculated as $$\rho(\epsilon)=\frac{4\pi gV}{h^3}p^2\fra …
- 27.2k
3
votes
1
answer
297
views
Understanding the behaviour of an interacting Bose gas
From the Bose-Einstein distribution it follows that a non-interacting Bose gas condenses into the Bose-Einstein condensate below a certain critical temperature. What happens when interactions are intr …
- 27.2k
2
votes
2
answers
713
views
Is the Lennard-Jones potential applicable to any phase of a substance?
The Lennard-Jones potential describes long-range attraction and short-range repulsion. In both solids, liquids, and gases there are attractions and repulsions.
Does it mean that Lennard-Jones form …
- 27.2k
8
votes
2
answers
4k
views
The Schrödinger equation as an Euler-Lagrange equation
In section 1.2 on p. 14 in the book Many-Particle Physics by Gerald D. Mahan, he points out that the Schrödinger equation in the form
$$i\hbar\frac{\partial\psi}{\partial t}~=~\Big[-\frac{\hbar^2\nabl …
- 27.2k