May 16, 2019

Effective asymptotic for a sum of class numbers

Date: May 16, 2019 | 11:00 am – 12:00 pm
Speaker: Giacomo Cherubini, Alfréd Rényi Institute of Mathematics in Budapest
Location: Raiffeisen Lecture Hall, Central Building

For positive discriminants d, let h(d) and R(d) be class number and regulator of the real quadratic field Q(sqrt(d)).
In 1944 Siegel computed the asymptotic for the sum of h(d)R(d), where one orders the summands by increasing discriminants d.
If we change ordering and we list h(d) according to the size of the regulators R(d), it is possible to prove a different asymptotic, and to (partially) separate the information attached to h(d) and to R(d).
In the talk I will explain how this problem is related to the prime geodesic theorem and to the spectral theory of automorphic forms, which provides useful techniques to prove an asymptotic with strong bounds on the error term. I will also quickly explain how the methods generalize to study certain class numbers of quadratic forms over Gaussian integers.

More Information:

Date:
May 16, 2019
11:00 am – 12:00 pm

Speaker:
Giacomo Cherubini, Alfréd Rényi Institute of Mathematics in Budapest

Location:
Raiffeisen Lecture Hall, Central Building

Contact:

OOSTHUIZEN-NOCZIL Birgit

Email:
boosthui@ist.ac.at

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