Are retroflex consonants geminated?
Do the consonant clusters rn rs rl rt rd represent single or geminated retroflex consonants?
I've tried for some time now to come up with words with geminated versions of those consonant clusters and I can only find one and that is Värtahamnen, where rt is geminated. That is however a name (a port in Stockholm) and that name is a compound word.
I'm just gonna say that they are almost always single. People will probably point out exceptions but I can't come up with any. I hope I shed at least some light on the subject.