Kekeedme's latest activity

Wow! Thank you so much for your help. I appreciate it, and am glad that you made me go through it step by step to I could see it myself...

Yep!

$$\sum_{\sigma m} a_\sigma(\vec{k})\vec{\epsilon}_\sigma(\vec{k})\times [(-\vec{k})\times a_m(-\vec{k})\vec{\epsilon}_m(-\vec{k})]$$...

The terms in which the indices are the same go back to themselves when we do ##\vec k \rightarrow -\vec k##, so they are even in...

Thank you so much! You have been a GREAT help. Can you give me a little clarification on the index relabeling in this particular case to...

It does still work for ##\epsilon_{\sigma}(-\vec{k}) \cdot \epsilon_m(-\vec{k})## right? Just not ##\epsilon_{\sigma}(\vec{k}) \cdot...

Oh my days! I can't believe I performed an improper book keeping on taking the delta function, that completely changes the signs on the...

Ok. It is probably starring at me or I am doing something wrong, but unfortunately, I am not seeing what else I can do. Attached you...

Right, and this is where I had gotten confused. I think I am not seeing what the symmetry argument should be, for instance, let us say I...

Ah, sorry, in my actual I made it a double sum not to prejudice the fact that the electric and magnetic field would be at same...

Hi @Matterwave I am not making any real headway, would you mind taking a look please? I attached the part I am working with now after...

hmm, I will go back and check. I am not sure which symmetry properties are helpful here, but I might be overlooking.

You don't need to do anything fancy, it's basically just a bunch of plug and chug and being very careful with every term. Take...

Hi Matterwave, thank you for your reply. This is how I did it at first, plug and chug, used ##dˆ3k## variable for say ##\vec{E}## and...

I am sorry to hear that Bill. But thank you again for all your suggestions.