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Geometric approach to the local Jacquet-Langlands correspondence
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 136, Number 4, August 2014
- pp. 1067-1091
- 10.1353/ajm.2014.0028
- Article
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In this paper, we give a purely geometric approach to the local Jacquet-Langlands correspondence
for ${\rm GL}(n)$ over a $p$-adic field, under the assumption that the invariant of the division algebra
is $1/n$. We use the $\ell$-adic \'etale cohomology of the Drinfeld tower to construct the correspondence
at the level of the Grothendieck groups with rational coefficients. Moreover, assuming that $n$ is prime,
we prove that this correspondence preserves irreducible representations. This gives a purely local proof
of the local Jacquet-Langlands correspondence in this case. We need neither a global automorphic technique
nor detailed classification of supercuspidal representations of ${\rm GL}(n)$.