Posted: Oct 06, 2011 8:03 pm
by mizvekov
cavarka9 wrote:I was considering that a particle is a structure which has certain properties that it follows,the most important being that it is localized, it must follow conservation of energy, spin, charge and must not do crazy things like vanish without any trace or appear from no where, unless there are perhaps other dimensions. It must also not behave like a wave.

That's the classical definition of particle, and if that's the only definition that you find acceptable, then in QM and QFT there are no such particles.
There is another 'thing' in QFT that is also called 'particle', and these things under certain circumstances (high energies) behave approximately like the classical particles. These particles can be though of as ripples in the quantum field, and they are described in terms of harmonic oscillators.