On the modularity of reducible mod $l$ Galois representations

On the modularity of reducible mod $l$ Galois representations

Given an odd, semisimple, reducible, $2$-dimensional mod $l$ Galois representation, we investigate the possible levels of the modular forms giving rise to it. When the representation is the direct sum of the trivial character and a power of the mod $l$ cyclotomic character, we are able to characteri...

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Veröffentlicht in:Mathematical research letters 2016, Vol.23 (1), p.15-41
Hauptverfasser: Billerey, Nicolas, Menares, Ricardo
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Number Theory
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description Given an odd, semisimple, reducible, $2$-dimensional mod $l$ Galois representation, we investigate the possible levels of the modular forms giving rise to it. When the representation is the direct sum of the trivial character and a power of the mod $l$ cyclotomic character, we are able to characterize the primes that can arise as levels of the associated newforms. As an application, we determine a new explicit lower bound for the highest degree among the fields of coefficients of newforms of trivial Nebentypus and prime level. The bound is valid in a subset of the primes with natural (lower) density at least 3/4.
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Number Theory
title On the modularity of reducible mod $l$ Galois representations
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