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arXiv · 1003.1104

On q-asymptotics for linear q-difference-differential equations with Fuchsian and irregular singularities

Alberto Lastra·Stephane Malek·Javier Sanz
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Abstract

We consider a Cauchy problem for some family of q-difference-differential equations with Fuchsian and irregular singularities, that admit a unique formal power series solution in two variables t and z for given formal power series initial conditions. Under suitable conditions and by the application of certain q-Borel and Laplace transforms (introduced by J.-P. Ramis and C. Zhang), we are able to deal with the small divisors phenomenon caused by the Fuchsian singularity, and to construct actual holomorphic solutions of the Cauchy problem whose q-asymptotic expansion in t, uniformly for z in the compact sets of the complex plane, is the formal solution. The small divisors's effect is an increase in the order of q-exponential growth and the appearance of a power of the factorial in the corresponding q-Gevrey bounds in the asymptotics.

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Alberto Lastra, Stephane Malek, Javier Sanz. 2012-01-30. On q-asymptotics for linear q-difference-differential equations with Fuchsian and irregular singularities. https://arxiv.org/abs/1003.1104

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