On Serre’s injectivity question and norm principle

Abstract

Let $k$ be a field of characteristic not $2$. We give a positive answer to Serre's injectivity question for any smooth connected reductive $k$-group whose Dynkin diagram contains connected components only of type $A_n$, $B_n$ or $C_n$. We do this by relating Serre's question to the norm principles proved by Barquero and Merkurjev. We give a scalar obstruction defined up to spinor norms whose vanishing will imply the norm principle for the non-trialitarian $D_n$ case and yield a positive answer to Serre's question for connected reductive $k$-groups whose Dynkin diagrams contain components of (non-trialitarian) type $D_n$ too. We also investigate Serre's question for quasi-split reductive $k$-groups.