Under GRH, the count of primes p ≤ x with Frobenius trace a_{1,p}(A) = t is ≪ x to a power strictly less than 1, yielding that |a_{1,p}(A)| exceeds p to a positive power for almost all p.
On the Lang--Trotter conjecture for Siegel modular forms
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abstract
Let $f$ be a genus two cuspidal Siegel modular eigenform. We prove an adelic open image theorem for the compatible system of Galois representations associated to $f$, generalising the results of Ribet and Momose for elliptic modular forms. Using this result, we investigate the distribution of the Hecke eigenvalues $a_p$ of $f$, and obtain upper bounds for the sizes of the sets $\{p \le x : a_p = a\}$ for fixed $a\in\mathbf{C}$, in the spirit of the Lang--Trotter conjecture for elliptic curves.
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Bounds for the distribution of the Frobenius traces associated to a generic abelian variety
Under GRH, the count of primes p ≤ x with Frobenius trace a_{1,p}(A) = t is ≪ x to a power strictly less than 1, yielding that |a_{1,p}(A)| exceeds p to a positive power for almost all p.