/sci/ - Science & Math

Quantum Field Theory

>>4668838
nice 1, faggot
'Field Theory' is in OP's subject field

>>4668840
You're supposed to be controlling that temper missy.

>>4668852
i am, that wasnt an 'angry post' that was a 'rolls eyes, lol, you're retarded' post.

>>4668852
>>4668840
>>4668838
At least I'm getting some form of response

>>4668858
http://en.wikipedia.org/wiki/Electric_field

"In physics, an electric field is the region of space surrounding electrically charged particles and time-varying magnetic fields. The electric field depicts the force exerted on other electrically charged objects by the electrically charged particle the field is surrounding. "

"An electric field that changes with time, such as due to the motion of charged particles in the field, influences the local magnetic field. That is, the electric and magnetic fields are not completely separate phenomena; what one observer perceives as an electric field, another observer in a different frame of reference perceives as a mixture of electric and magnetic fields. For this reason, one speaks of "electromagnetism" or "electromagnetic fields". In quantum electrodynamics, disturbances in the electromagnetic fields are called photons, and the energy of photons is quantized."

>>4668857
I'll be keeping an eye on you...

>>4668869
for wat?

>>4668873
We'll see.

>>4668861
How does this reconcile time-invariant electrical fields / or do such fields not exist?

>>4668840
>>4668857
>>4668869
>>4668873

This is why we should have global forced_anon.

Photons are excited states of electromagnetic fields. Modes of the electromagnetic field wave in classical mechanics because they have Hamiltonians like a harmonic oscillator. When you use that same Hamiltonian in quantum mechanics, you get a system with equally spaced energy levels.

>>4668909
Can you dumb this down considerably?
I have yet to study any quantum mechanics or otherwise yet...

>>4668920
Each kind of electromagnetic wave has energy levels, and a photon is when the wave is in an excited level rather than the lowest one.

>>4668925
Woah, what happens at the lowest possible energy level of the field?

>>4668933
That is what we call "vacuum."

>>4668939
So around a charge configuration such as a point charge at rest, is there a
position in space surrounding it where there are never any photons?

>>4668834
The eletric field is not really a "physical thing". There is no "force at a distance". Interaction alwayas happens directly, like with billard-balls on a pool table.

Interacting between particles with charge occurs because of photon interaction.

When an electrically charged object affects another what is really happeneing is that the charged object is affecting a photon, which in turn affects another photons, and so on....until one of these photons affects the other charged object. We view this as the "electromagntic field", but all it really is is just alot of photon exchanges!

Make sense?

>>4668952
Blow my mind, but yes, woah physics just continues to become more and more amazing...
So, where do all these photons come from? Are they created by the charged particles as they move in space or something?

>>4668952
>The eletric field is not really a "physical thing". There is no "force at a distance". Interaction alwayas happens directly, like with billard-balls on a pool table.
And I realize again that putting to much effort into this thread is pointless as OP, with no understanding of the subject matter, lacks a way to distinguish which posts are bollocks.

>>4669025
...
Thanks for trying /sci/.

>>4668960
Photons are created by alot of particle interactions. Indeed a charged particle can emit and absorb photons.

>>4668952
>The eletric field is not really a "physical thing". There is no "force at a distance". Interaction alwayas happens directly, like with billard-balls on a pool table.
You do not understand QFT.

The gauge field is the object which more closely resembles physical reality. The fluctuations in the field are off-shell approximations from a perturbative series expansion used as a calculation technique as we cannot do a continuum limit with the partition function on standard field theories (eg have smooth, continuous space) non-perturbatively.