Posted: Oct 06, 2011 7:45 pm
by twistor59
cavarka9 wrote:
I however think, that for something to be a particle it must be localized and must follow conservation.


Yep, when people think of particles, they usually have some sort of localization in mind.

Conservation, yes, you want the particle to retain some sort of identity. However, with indistinguishable particles you can't say which is which if they have any overlap. Classic analogy is two people with a piece of rope, they simultaneously wiggle their ends, the wiggles travel towards each other, then pass through each other and are received by the other guy. Or do they ? Who's to say that the two wiggles didn't travel towards each other then bounce off each other and back to the originator ? The wiggles are indistinguishable, and so are identical particles in quantum theory.

What you CAN do, though, is talk about the number of particles. Particles are countable.