We study the automorphic theta representation $\Theta_{2n}^{(r)}$ on the $r$-fold cover of the symplectic group $Sp_{2n}$. This representation is obtained from the residues of Eisenstein series on this group.
If $r$ is odd,
$n\le r <2n$, then under a natural hypothesis on the theta representations, we show that
$\Theta_{2n}^{(r)}$ may be used to construct a globally generic representation
$\sigma_{2n-r+1}^{(2r)}$ on the $2r$-fold cover of $Sp_{2n-r+1}$. Moreover, when $r=n$ the
Whittaker functions of this representation attached to factorizable data are factorizable, and the unramified local factors may be computed in terms of $n$-th order Gauss sums. If $n=3$ we prove these results, which in that case pertain to the six-fold cover of $Sp_4$, unconditionally. We expect that in fact the representation constructed here, $\sigma_{2n-r+1}^{(2r)}$, is precisely $\Theta_{2n-r+1}^{(2r)}$; that is, we conjecture relations between theta representations on different covering groups.
Friedberg, S. &. & Ginzburg, D. &. (2017). Theta functions on covers of symplectic groups. Bulletin of the Iranian Mathematical Society, 43(Issue 4 (Special Issue)), 89–116.
MLA
Friedberg, S. &., & Ginzburg, D. &. "Theta functions on covers of symplectic groups", Bulletin of the Iranian Mathematical Society, 43, Issue 4 (Special Issue), 2017, 89–116.
HARVARD
Friedberg, S. &., & Ginzburg, D. &. (2017). 'Theta functions on covers of symplectic groups', Bulletin of the Iranian Mathematical Society, 43(Issue 4 (Special Issue)), pp. 89–116.
CHICAGO
Friedberg, S. &. & Ginzburg, D. &., "Theta functions on covers of symplectic groups." Bulletin of the Iranian Mathematical Society, 43 Issue 4 (Special Issue) (2017): 89–116,
VANCOUVER
Friedberg S. &., Ginzburg D. &. Theta functions on covers of symplectic groups. BIMS. 2017;43(Issue 4 (Special Issue)):89–116.