How should our tag names look like in Q&A?
On the blog, it was suggested that we could use ArXiV tags. I had upvoted the suggestion then, but now that I think about it, I don't like the idea very much. Not in Q&A. ArXiV tags are quite broad, like gr-qc, etc. There is no way it can have a (relatively) more specific tag like "heterotic-string", or "horava-witten-domain-wall", or something like that. They are also not particularly helpful for our SEO. They may seem to make the site look more professional, but they don't. They look funny, and make people roll their eyes, thinking "What a pathetic attempt to look professional or high-level.", effectively chasing them away from the site.
It has however been suggested on Meta.TP.SE that while the tagging system need not be completely ArXiVised, every post must have (not technically must, but in terms of rules) an ArXiV tag. However, I agree with Piotr Migdal's answer there. I think that ArXiV tags are also skewed against Experimental Physics and Phenomenology. It also excludes a lot of fields, especially in Experimental Physics and Phenomenlogy.
Another option is PACS, which has been suggested in Meta.TP.SE. However, this is too cryptic, and is not very helpful for our SEO either. Who in the world will understand what physics field 12.10.Kt is about without checking?
Another possibility is MathsOverflow style top-level tags, like mp.mathematical-physics, or something like that. But Maths Overflow uses it as a replacement for a categorial system, which we already have (Note that as a mathematical site, ag.algebraic-geometry or mp.mathematical-physics make sense). We could implement the same concept for more specific things, like st.string-theory, qft.quantum-field-theory, lqg.loop-quantum-gravity, or something. But I think that my comment about "What a pathetic attempt to look professional or high-level." still applies (note that this does not apply to MathsOverflow because it uses such a structure as a replacement for a categorial system, which means that there is a practical reason.).
Or, we could use the existing tag system, where tags arise out of need, and are physics terminology in lowercase with hyphens instead of spacebars. This makes most sense, I think. Why, even research papers use such tags (keywords).