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Gauss–Manin connections for p -adic families of nearly overconvergent modular forms

Robert Harron, Liang Xiao (2014)

Annales de l’institut Fourier

We interpolate the Gauss–Manin connection in p -adic families of nearly overconvergent modular forms. This gives a family of Maass–Shimura type differential operators from the space of nearly overconvergent modular forms of type r to the space of nearly overconvergent modular forms of type r + 1 with p -adic weight shifted by 2 . Our construction is purely geometric, using Andreatta–Iovita–Stevens and Pilloni’s geometric construction of eigencurves, and should thus generalize to higher rank groups.

Generalized divisor problem for new forms of higher level

Krishnarjun Krishnamoorthy (2022)

Czechoslovak Mathematical Journal

Suppose that f is a primitive Hecke eigenform or a Mass cusp form for Γ 0 ( N ) with normalized eigenvalues λ f ( n ) and let X > 1 be a real number. We consider the sum 𝒮 k ( X ) : = n < X n = n 1 , n 2 , ... , n k λ f ( n 1 ) λ f ( n 2 ) ... λ f ( n k ) and show that 𝒮 k ( X ) f , ϵ X 1 - 3 / ( 2 ( k + 3 ) ) + ϵ for every k 1 and ϵ > 0 . The same problem was considered for the case N = 1 , that is for the full modular group in Lü (2012) and Kanemitsu et al. (2002). We consider the problem in a more general setting and obtain bounds which are better than those obtained by the classical result of Landau (1915) for k 5 . Since the result is valid for arbitrary...

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