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Abstract:

Given a prime p ≥ 5 and an abstract odd representation pn with coefficients modulo pn (for some n ≥ 1) and big image, we prove the existence of a lift of pn to characteristic 0 whenever local lifts exist (under minor technical conditions). Moreover, our results allow to chose the lift's inertial type at all primes but finitely many (where the lift is of Steinberg type). We apply this result to the realm of modular forms, proving a level lowering theorem modulo prime powers and providing examples of level raising. An easy application of our main result proves that given a modular eigenform f whose Galois representation is not induced from a character (i.e., f has no inner twists), for all primes p but finitely many, and for all positive integers n, there exists an eigenform g = f, which is congruent to f modulo pn. © European Mathematical Society.

Registro:

Documento: Artículo
Título:Congruences between modular forms modulo prime powers
Autor:Camporino, M.; Pacetti, A.
Filiación:Departamento de Matematica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
FaMAF-CIEM, Universidad Nacional de Cordoba, Cordoba, 5000, Argentina
Palabras clave:Galois representations; Modular forms
Año:2018
Número:6
Página de inicio:1609
Página de fin:1643
DOI: http://dx.doi.org/10.4171/rmi/1037
Título revista:Stratum Plus
Título revista abreviado:Stratum Plus
ISSN:16089057
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16089057_v_n6_p1609_Camporino

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Citas:

---------- APA ----------
Camporino, M. & Pacetti, A. (2018) . Congruences between modular forms modulo prime powers. Stratum Plus(6), 1609-1643.
http://dx.doi.org/10.4171/rmi/1037
---------- CHICAGO ----------
Camporino, M., Pacetti, A. "Congruences between modular forms modulo prime powers" . Stratum Plus, no. 6 (2018) : 1609-1643.
http://dx.doi.org/10.4171/rmi/1037
---------- MLA ----------
Camporino, M., Pacetti, A. "Congruences between modular forms modulo prime powers" . Stratum Plus, no. 6, 2018, pp. 1609-1643.
http://dx.doi.org/10.4171/rmi/1037
---------- VANCOUVER ----------
Camporino, M., Pacetti, A. Congruences between modular forms modulo prime powers. Stratum Plus. 2018(6):1609-1643.
http://dx.doi.org/10.4171/rmi/1037