On congruences mod ${\mathfrak p}^m$ between eigenforms and their attached Galois representations
| dc.creator | Chen, I. | |
| dc.creator | Kiming, I. | |
| dc.creator | Rasmussen, J. B. | |
| dc.date | 2008-09-22 | |
| dc.date.accessioned | 2026-07-07T10:04:21Z | |
| dc.date.available | 2026-07-07T10:04:21Z | |
| dc.description | Given a prime $p$ and cusp forms $f_1$ and $f_2$ on some $Γ_1(N)$ that are eigenforms outside $Np$ and have coefficients in the ring of integers of some number field $K$, we consider the problem of deciding whether $f_1$ and $f_2$ have the same eigenvalues mod ${\mathfrak p}^m$ (where ${\mathfrak p}$ is a fixed prime of $K$ over $p$) for Hecke operators $T_{\ell}$ at all primes $\ell\nmid Np$. When the weights of the forms are equal the problem is easily solved via an easy generalization of a theorem of Sturm. Thus, the main challenge in the analysis is the case where the forms have different weights. Here, we prove a number of necessary and sufficient conditions for the existence of congruences mod ${\mathfrak p}^m$ in the above sense. The prime motivation for this study is the connection to modular mod ${\mathfrak p}^m$ Galois representations, and we also explain this connection. | |
| dc.identifier | https://arxiv.org/abs/0809.3622 | |
| dc.identifier | http://arxiv.org/abs/0809.3622 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/169646 | |
| dc.subject | Number Theory | |
| dc.subject | 11F80; 11F33 | |
| dc.title | On congruences mod ${\mathfrak p}^m$ between eigenforms and their attached Galois representations | |
| dc.type | text |