Non-Interacting Particles


by Cryxic
Tags: noninteracting, particles
Cryxic
Cryxic is offline
#1
Dec11-09, 02:24 PM
P: 53
I just wanted to clarify something conceptual with non-interacting particles. So if you have three identical non-interacting fermions (say electrons), is it true that they are distinguishable (since they're non-interacting)? Or are they indistinguishable since they're still identical?
Phys.Org News Partner Physics news on Phys.org
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
xepma
xepma is offline
#2
Dec11-09, 02:37 PM
P: 527
No, the indistinguishability of the electrons is also present in the absence of interactions. Any wavefunction of the electrons is anti-symmetrized. So although the electrons do not interact, they still feel some form of repelment as they cannot occupy the same state.

It's ofcourse a mathematical statement, since non-interacting particles can hardly be considered physical.
Cryxic
Cryxic is offline
#3
Dec11-09, 02:44 PM
P: 53
Quote Quote by xepma View Post
No, the indistinguishability of the electrons is also present in the absence of interactions. Any wavefunction of the electrons is anti-symmetrized. So although the electrons do not interact, they still feel some form of repelment as they cannot occupy the same state.

It's ofcourse a mathematical statement, since non-interacting particles can hardly be considered physical.
Ok thanks. So basically: even though they're non-interacting, they're still indistinguishable and they obey the Pauli exclusion principle. Correct?

xepma
xepma is offline
#4
Dec11-09, 02:48 PM
P: 527

Non-Interacting Particles


Yes, indeed.


Register to reply

Related Discussions
Strongly interacting vs Weakly interacting particles Atomic, Solid State, Comp. Physics 2
Identical, interacting spin 1/2 particles Advanced Physics Homework 1
Two identical non-interacting particles Advanced Physics Homework 1
interacting virtual particles? Quantum Physics 7
Non-interacting particles? High Energy, Nuclear, Particle Physics 23