http://fa.wikipedia.org/wiki/فن_شعر_(ارسطو)If the reader in Iran understands that this usage refers to "literature" and not just to "poetry" (actually, Aristotle was focused on drama) there should be no problem.
However, I am afraid that since the reference in Persian is specifically to Aristotle's work "Poetics", there might be a problem in conveying Greenblatt's meaning...that is, "poetics" with a small "p"...this "poetics" is much more general, which is why I made my suggestion as I did.
It was very interesting researching this topic.
