The few times I've faced Zarya in Quick Play, I noticed one or two times that Lucio's sound blast didn't seem to push her back while she had her barrier on, but given how finicky pushback is in Overwatch, I'm not sure if that was because of the barrier of because of general wonkiness.
Do Zarya's barriers stop the knockback effects of Lucio's sound blast, Pharah's Concussive Blast, and so on?