Dispersion Relation: What is it for Photons?

[yellowgold]

What is the dispersion relation in photons? "(Frequency momentum or etc)

 

[Meir Achuz]

A dispersion relation is the relation between the frequency omega and the wave number k.

 

[lightarrow]

Or, said in another way, how the phase speed of light (and hence, the index of refraction) depends on the light's frequency in that specific material/medium.

 

[malawi_glenn]

lightarrow, why restrict yourself to light? The dispersion relation are for waves, all waves, as far as I have understood it.

 

[lightarrow]

lightarrow, why restrict yourself to light? The dispersion relation are for waves, all waves, as far as I have understood it.

Ah, yes, of course, but the OP asked about photons.

 

[malawi_glenn]

Ah, yes, of course, but the OP asked about photons.

haha yeah now I saw he did! ;-)
Though he asked what dispersion relation was "in general"

 

[Avodyne]

The dispersion relation for photons is
$$\omega=|\vec k|c.$$

 

[yellowgold]

Thank you very much everybody. I understood it.