I recently came across a question concerning harmonic measure here, and was wondering if there is a good reference summarizing different methods of estimating harmonic measure? Specifically, I would be interested in special cases like a sharp estimate for convex domains or other domain types.
I found the general Principle of Extension of Domain here (also called Carleman's Principle of Monotoneity), however the bound presented there is not optimal according to the source: R. Nevanlinna, "Analytic functions".