Everywhere convergence of Eisenstein series under a weakened Godement criterion

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Let GG be a rank 22 hyperbolic Kac--Moody group, let K\GR/GZK\backslash G_\mathbb{R}/G_\mathbb{Z} be the arithmetic quotient, and let Eν(g)E_\nu(g) be the Eisenstein series induced from a quasi-character ν\nu of a Borel subgroup. Write A′A' for the cone

A′={a∈A+:aαi<1, i∈I}.A'=\{a\in A^+:a^{\alpha_i}<1,\ i\in I\}.

Everywhere-convergence conjecture. Eν(g)E_\nu(g) converges absolutely for g∈KA′Ng\in KA'N and ν\nu satisfying Re ν(hαi)<−1\mathrm{Re}~\nu(h_{\alpha_i})<-1, i∈Ii\in I. The proved result gives almost-everywhere convergence under Godement's stronger criterion; the conjecture weakens that condition and asserts convergence for every element of NN, rather than outside a measure-zero subset.

References

Primary source

Lisa Carbone, Kyu-Hwan Lee and Dongwen Liu, “Eisenstein series on rank 2 hyperbolic Kac–Moody groups”, arXiv:1306.3280 (2015).

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