Connection between the harmonic analysis on the sphere and the harmonic analysis on the one-sheeted hyperboloid: an analytic continuation viewpoint

In a previous paper $[$B,V-1$]$, an algebra of holomorphic perikernels'' on a complexified hyperboloid $ X^{(c)}_{d-1} $ (in $\Bbb C^d)$ has been introduced; each perikernel $ {\cal K} $ can be seen as the analytic continuation of a kernel $ {\bf K} $ on the unit sphere $ \Bbb S^{d-1} $ in an appropriate cut-domain’’ , while the jump of $\mathcal{K}$ across the corresponding cut'' defines a Volterra kernel $ K $ (in the sense of J. Faraut $\lbrack$Fa-1$\rbrack$) on the one-sheeted hyperboloid $ X_{d-1} $ (in $ \Bbb R^d). $ \par In the present paper, we obtain results of harmonic analysis for classes of perikernels which are invariant under the group $ {\rm SO}(d,\Bbb C) $ and of moderate growth at infinity. For each perikernel $ {\cal K} $ in such a class, the Fourier-Legendre coefficients of the corresponding kernel $ {\bf K} $ on $ \Bbb S^{d-1} $ admit a carlsonian analytic interpolation $ \tilde F(\lambda) $ in a half-plane, which is the spherical Laplace transform’'\ of the associated Volterra kernel $K$ on $X_{d-1}\mathrm{.}$ Moreover, the composition law $\mathcal{K}={\mathcal{K}}_1{\ast }^{(c)}{\mathcal{K}}_2$ for perikernels (interpreted in terms of convolutions for the