Copyright © The Author 2007. Published by Oxford University Press.
Hecke Type Formula for Unified WittenReshetikhinTuraev Invariants as Higher-Order Mock Theta Functions
Department of Physics, Graduate School of Science, University of Tokyo, Hongo 731, Bunkyo, Tokyo 1130033, Japan
Correspondence: Correspondence to be sent to: Kazuhiro Hikami, Department of Physics, Graduate School of Science, University of Tokyo, Hongo 731, Bunkyo, Tokyo 1130033, Japan. e-mail: hikami{at}phys.s.u-tokyo.ac.jp
We study the unified WittenReshetikhinTuraev invariant for the Brieskorn homology sphere
(2, 3, 6 p 1) based on the cyclotomic expansion of the colored Jones polynomial for twist knot
p. We discuss that the invariant has the same asymptotic expansion in N
with the Ramanujan mock theta function when q is the root of unity q = exp(2
i/N), and that it can be regarded as the (6p 1)-th order mock theta function. It is shown that it has the Hecke-type formula as in the case of the mock theta functions, though the quadratic form is positive definite while indefinite for almost all the Ramanujan mock theta functions.