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Dynamical methods for rapid computations of L-functions

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Pankaj Vishe
New York U/MPI
Mit, 02/02/2011 - 14:15 - 15:15
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Let $f$ be a holomorphic or Maass cusp form on the upper half plane. We use the slow divergence of the horocycle flow on the upper half plane to get an algorithm to compute $L(f,1/2+iT)$ up to a maximum error $O(T^{-\gamma})$ using $O(T^{7/8+\eta})$ operations. Here $\gamma$ and $\eta$ are any positive numbers and the constants in $O$ are independent of $T$. We thus improve the current approximate functional equation based algorithms which have complexity $O(T^{1+\eta})$.

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