Cyclic odd degree base change lifting for unitary groups in three variables

Ping Shun Chan, Yuval Z. Flicker

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

2 اقتباسات (Scopus)

ملخص

Let F be a number field or a p-adic field of odd residual characteristic. Let E be a quadratic extension of F, and F′ an odd degree cyclic field extension of F. We establish a base-change functorial lifting of automorphic (respectively, admissible) representations from the unitary group U(3, E/F) to the unitary group U(3, F′ E/F′). As a consequence, we classify, up to certain restrictions, the packets of U(3, F′ E/F′) which contain irreducible automorphic (respectively, admissible) representations invariant under the action of the Galois group Gal(F′ E/E). We also determine the invariance of individual representations. This work is the first study of base change into an algebraic group whose packets are not all singletons, and which does not satisfy the rigidity, or 'strong multiplicity one', theorem. Novel phenomena are encountered: e.g. there are invariant packets where not every irreducible automorphic (respectively, admissible) member is Galois-invariant. The restriction that the residual characteristic of the local fields be odd may be removed once the multiplicity one theorem for U(3) is proved to hold unconditionally without restriction on the dyadic places.

اللغة الأصليةالإنجليزيّة
الصفحات (من إلى)1247-1309
عدد الصفحات63
دوريةInternational Journal of Number Theory
مستوى الصوت5
رقم الإصدار7
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - نوفمبر 2009
منشور خارجيًانعم

بصمة

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