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Uniform estimates of some oscillating integrals. (Russian) Zbl 0679.58047
Consider the oscillatory integral $$\int_{{\mathbb{R}}^ n}e^{i\tau f}\phi dx$$, where $$\phi$$ is concentrated in a neighborhood of the origin and f: $${\mathbb{R}}^ n\to {\mathbb{R}}$$ is analytic in a neighborhood of the origin with a critical point there. As $$\tau$$ $$\to \infty$$, the integral is of order $$\tau^{\beta}(\ln \tau)^ p$$, where $$\beta\leq 0$$ and p is a natural number. The author has shown previously [J. Sov. Math. 35, 2809- 2826 (1986); translation from Tr. Semin. Im. I. G. Petrovskogo 10, 150- 169 (1984; Zbl 0569.58033)] that when the dimension n equals 2, this estimate is uniform over small analytic perturbations of f in a neighborhood of the origin. This paper sharpens the result in the special case that $$p=0$$.
Reviewer: H.Boas

##### MSC:
 58J40 Pseudodifferential and Fourier integral operators on manifolds 58C25 Differentiable maps on manifolds 58K99 Theory of singularities and catastrophe theory
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