On the Archimedean Local Gamma Factors for Adjoint Representation of $\mathrm{GL}_3$, Part I

Studying the analytic properties of the partial Langlands $L$-function via Rankin-Selberg method has been proved to be successful in various cases. Yet in few cases is the local theory studied at the archimedean places, which causes a tremendous gap to complete the analytic theory of the complete $L$-function. In this paper, we will establish the meromorphic continuation and the functional equation of the archimedean local integrals associated with D. Ginzburg's global integral for the adjoint representation of $\mathrm{GL}_3$. Via the local functional equation, the local gamma factor $Γ(s,π,\mathrm{Ad},ψ)$ can be defined. In a forthcoming paper, we will compute the local gamma factor $Γ(s,π,\mathrm{Ad},ψ)$ explicitly, which fills in some blanks in the archimedean local theory of Ginzburg's global integral.

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