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We study the thin-shell conjecture for the Schatten classes. In particular, we establish the conjecture for the operator norm; we also improve on the best known bound for the Schatten classes, due to Barthe and Cordero-Erausquin [5], for a few more cases. Moreover, we show that a necessary condition for the conjecture to be true for any of the Schatten classes is a rather strong negative correlation property: this implies of course that, for the cases for which we already have the conjecture (as for example for the operator norm), but in fact also for all the cases for which we can get a better estimate than the one in [5], this negative correlation property follows. For the proofs, our starting point is techniques that were employed for the Schatten classes with regard to other problems in [24] and [16].

On the thin-shell conjecture for the Schatten classes