Un théorème à la "Thom-Sebastiani" pour les intégrales-fibres

Daniel Barlet (1, 2)

1 IECN - Institut Élie Cartan de Nancy
2 IUF - Institut universitaire de France

The aim of this article is to prove a Thom-Sebastiani theorem for the asymptotics of the fiber-integrals. This means that we describe the asymptotics of the fiber-integrals of the function \ $f \oplus g : (x,y) \to f(x) + g(y)$ \ on \ $(\mathbb{C}^p\times \mathbb{C}^q, (0,0))$ \ in term of the asymptotics of the fiber-integrals of the holomorphic germs \ $f : (\mathbb{C}^p,0) \to (\mathbb{C},0)$ \ and \ $g : (\mathbb{C}^q,0) \to (\mathbb{C},0)$. This reduces to compute the asymptotics of a convolution \ $\Phi_*\Psi$ \ from the asymptotics of \ $\Phi$ \ and \ $\Psi$ \ modulo smooth terms. \\ To obtain a precise theorem, giving the non vanishing of expected singular terms in the asymptotic expansion of \ $f\oplus g$, we have to compute the constants coming from the convolution process. We show that they are given by rational fractions of Gamma factors. This enable us to show that these constants do not vanish.\\

Mots clés: asymptotic expansions; fiber-integrals; Thom-Sebastiani theorem; Bernstein polynomial (b-function)

Domaines: Variables complexes [math.CV]; Géométrie algébrique [math.AG]

Daniel Barlet. Un théorème à la "Thom-Sebastiani" pour les intégrales-fibres. Annales de l'Institut Fourier, 2010, 60 (1), p. 319-353. ⟨10.5802/aif.2524⟩. ⟨hal-00325589v2⟩