I recently submitted a paper to the preprint arXiv, which was rejected because we didn't list all of the authors on the first page. We chose to follow the polymath model, using a generic name for our group, with a footnote linking to a place with all the actual contributors.
I was surprised that our paper was rejected, as there are many arXiv papers by "D.H.J. Polymath". Does anyone know if this is a recent change?
More importantly, what should be the practice for papers involving a huge number of coauthors in a collaborative setting? Is there a way to petition the arXiv for exceptions in such cases?