Image of pseudo-representations and coefficients of modular forms modulo p
Image of pseudo-representations and coefficients of modular forms modulo p
复制标题
模形式 p 的伪表示和系数的图像
DOI:
10.1016/j.aim.2019.07.001
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发表时间:
2019
影响因子:
1.7
通讯作者:
Bellaïche, Joël
中科院分区:
文献类型:
--
作者:
Bellaïche, Joël
We describe the image of general families of two-dimensional representations over compact semi-local rings. Applying this description to the family carried by the universal Hecke algebra acting on the space of modular forms of level N modulo a prime p, we prove new results about the coefficients of modular forms mod p. If f=∑ n= 0∞ a n q n is such a form, for which we can assume without loss of generality that a n= 0 if (n, N p)> 1, calling δ (f) the density of the set of primes ℓ such that a ℓ≠ 0, we prove that δ (f)> 0 provided that f is not zero (and if p= 2, not a multiple of Δ). More importantly, we prove, when p> 2, a uniform version of this result, namely that there exists a constant c> 0 depending only on N and p such that δ (f)> c for all forms f except for those in an explicit subspace of infinite codimension of the space of all modular forms mod p of level N. Forms in this subspace, called special modular forms mod p, are proved to be closely related to certain classes of modular forms mod p previously studied by the author, Nicolas and Serre, called cyclotomic and CM modular forms mod p.
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