The behavior of Hecke's L-function of real quadratic fields at s=0

Details The behavior of Hecke's L-function of real quadratic fields at s=0 The behavior of Hecke's L-function of real quadratic fields at s=0

2011-11-29

arxiv.org/abs/1111.6716v1

Mathematics

Number Theory

27 pages

Scientific paper

For a family of real quadratic fields $\{K_n=\FQ(\sqrt{f(n)})\}_{n\in \FN}$, a Dirichlet character $\chi$ modulo $q$ and prescribed ideals $\{\fb_n\subset K_n\}$, we investigate the linear behaviour of the special value of partial Hecke's L-function $L_{K_n}(s,\chi_n:=\chi\circ N_{K_n},\fb_n)$ at $s=0$. We show that for $n=qk+r$, $L_{K_n}(0,\chi_n,\fb_n)$ can be written as $$\frac{1}{12q^2}(A_{\chi}(r)+kB_{\chi}(r)),$$ where $A_{\chi}(r),B_{\chi}(r)\in \FZ[\chi(1),\chi(2),..., \chi(q)]$ if a certain condition on $\fb_n$ in terms of its continued fraction is satisfied. Furthermore, we write precisely $A_{\chi}(r)$ and $B_{\chi}(r)$ using values of the Bernoulli polynomials. We describe how the linearity is used in solving class number one problem for some families and recover the proofs in some cases. Finally, we list some families of real quadratic fields with the linearity.

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