@Shillywakes still not really following. anyway, I assume you mean specifically hashtags in the fediverse. that's not really going to lead to cohesive discussion because of the decentralized nature of the fediverse. I don't know what kind of #activitypub object, but in Mastodon, I think you're better served by just linking to a toot from your publication page or maybe creating an account specific to the topic, depending on how expansive your engagement with it is as the author