A generalized Kontsevich-Vishik trace for Fourier Integral Operators and the Laurent expansion of $ζ$-functions

Based on Guillemin's work on gauged Lagrangian distributions, we will introduce the notion of a poly-$\log$-homogeneous distribution as an approach to $ζ$-functions for a class of Fourier Integral Operators which includes cases of amplitudes with asymptotic expansion $\sum_{k\in\mathbb{N}}a_{m_k}$ where each $a_{m_k}$ is $\log$-homogeneous with degree of homogeneity $m_k$ but violating $\Re(m_k)\to-\infty$. We will calculate the Laurent expansion for the $ζ$-function and give formulae for the coefficients in terms of the phase function and amplitude as well as investigate generalizations to the Kontsevich-Vishik quasi-trace. Using stationary phase approximation, series representations for the Laurent coefficients and values of $ζ$-functions will be stated explicitly. Additionally, we will introduce an approximation method (mollification) for $ζ$-functions of Fourier Integral Operators whose symbols have singularities at zero by $ζ$-functions of Fourier Integral Operators with regular symbols.

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