Earlier quoted context omitted.
Is it generally true that, if the Emperor has to refer to himself by name, he'll use his birth name? The one case I've seen that seems this way is that the first author of this paper on fish genetics [1] is listed as "Akihito". [1] https://www.ncbi.nlm.nih.gov/pubmed/26475939
Oh wow, it must be insane to be co-author to the emperor ! From the outside it's a weird juxtaposion of a traditional, old (from a European point of view) system of state and an everyday modern way of conducting scientific research. You'd just not expect this kind of contact, somehow.
Well, what seems to be the most visible European monarchy outside of its own country (the British) seems to still largely adhere to the custom of the monarch (and, to a lesser extent, the close royal family) refraining from anything that looks like work (military service of the close royal family being a notable exception) outside of royal duties, which might color that expectation.