For the areas I used to work in for many years, high energy physics and quantum gravity, I can&#x27;t think of a single exception.<p>Of course I don&#x27;t have total knowledge of these fields, only my corner of them, and I&#x27;m sure you&#x27;ll find a counterexample if you dig deep enough, but if counterexamples are remarkable and rare, then the heuristic: &quot;Not on the arxiv, not likely to be credible&quot; stands.