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/sci/ - Science & Math

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File: 19 KB, 500x224, photon-emission.jpg [View same] [iqdb] [saucenao] [google]
7202426 No.7202426 [Reply] [Original]

what is a photon physically when it's emitted? a point field like an electron but smaller?

also, are photons only released by leptons dropping energy levels? or can any elementary particle do it?

and why is it that they have to always move at c, but can be absorbed or bent by black holes? wouldn't that field cause acceleration, a change in velocity?

>> No.7202451
File: 15 KB, 1060x353, qed_eGammaVertex1.png [View same] [iqdb] [saucenao] [google]
7202451

>>7202426
>are photons only released by leptons dropping energy levels?
no, you have the famous feyman diagram in QED, where a photon = gamma results from a e+ and a e-

>> No.7202454
File: 9 KB, 619x385, qed_ep_tChannel.png [View same] [iqdb] [saucenao] [google]
7202454

>>7202451
this diagram is better

these are for free e- and e+ floating around, not for the e- who live in an atom

>> No.7202465
File: 15 KB, 236x214, image.jpg [View same] [iqdb] [saucenao] [google]
7202465

>>7202426
It's not emitted. It's a disturbance in a field.

Lrn2physics.

>> No.7202469

>>7202465
how can a disturbance in a field be in discreet packets?

>> No.7202471

>>7202426
Know smoke rings and how you can propel a torus? Well its not at all like that. But if you twist a little bit of electric and magnetic field together it corkscrews away.