%0 Journal Article
%T A note on L-packets and abelian varieties over local fields
%A Jeff Achter
%A Clifton Cunningham
%J Mathematics
%D 2014
%I arXiv
%X A polarized abelian variety (X,\lambda) of dimension g over a local field K determines an admissible representation of GSpin_{2g+1}(K). We show that the restriction of this representation to Spin_{2g+1}(K) is reducible if and only if X is isogenous to its twist by the quadratic unramified extension of K. When g=1 and K = Q_p, we recover the well-known fact that the admissible GL_2(K) representation attached to an elliptic curve E is reducible upon restriction to SL_2(K) if and only if E has supersingular reduction.
%U http://arxiv.org/abs/1402.4082v2