A constraint for twist equivalence of cusp forms on GL$(n)$

نویسندگان

چکیده

This note answers, and generalizes, a question of Kaisa Matomaki. We show that given two cuspidal automorphic representations $\pi_1$ $\pi_2$ $GL(n)$ over number field $F$ respective conductors $N_1$, $N_2$, every character $\chi$ such $\pi_1\otimes\chi\simeq\pi_2$ conductor $Q$, satisfies the bound: $Q^n\mid N_1N_2$. If at finite place $v$, $\pi_{1,v}$ is discrete series whenever it ramified, then $Q^n$ divides least common multiple $[N_1,N_2].$

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ژورنال

عنوان ژورنال: Functiones et Approximatio Commentarii Mathematici

سال: 2021

ISSN: ['0208-6573', '2080-9433']

DOI: https://doi.org/10.7169/facm/1913