For a university project I want to classify authors according to the subjects/domains they frequently publish in. For this purpose I want to first establish a subject classification with the according hierarchies (for example, chemical engineering would be a sub-subject of physical sciences and engineering).
Instead of creating my own classification/hierarchy, I would like to use an official classification of subjects. Unfortunately, I have not been able to find one that is universally accepted.
What I did find are the classifications of different publishers, for example the subjects listed for ScienceDirect.
So my question is:
Is there any official, widely used and accepted subject classification?
One thing I'd like to add: English is not my mother tongue so it might be entirely possible that I am just using the wrong words for doing the search. I’ve been looking for subject or domain classifications. Maybe there is an entirely different term for what I am actually looking for.