Abstract
We study a class of hyperbolic Cauchy problems, associated with linear operators and systems with polynomially bounded coefficients, variable multiplicities and involutive characteristics, globally defined on \(\mathbb {R}^n\). We prove well-posedness in Sobolev-Kato spaces, with loss of smoothness and decay at infinity. We also obtain results about propagation of singularities, in terms of wave-front sets describing the evolution of both smoothness and decay singularities of temperate distributions. Moreover, we can prove the existence of random-field solutions for the associated stochastic Cauchy problems. To these aims, we first discuss algebraic properties for iterated integrals of suitable parameter-dependent families of Fourier integral operators, associated with the characteristic roots, which are involved in the construction of the fundamental solution. In particular, we show that, also for this operator class, the involutiveness of the characteristics implies commutative properties for such expressions.
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Acknowledgements
We are grateful to an anonymous Referee, for the very careful reading of the paper, the constructive criticism, and the many suggestions, aimed at improving the overall quality of the presentation of our results. The second and third author have been partially supported by their own FFABR 2017 grants by Ministero dell’Istruzione, dell’Università e della Ricerca.
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Communicated by Joachim Escher.
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Abdeljawad, A., Ascanelli, A. & Coriasco, S. Deterministic and stochastic Cauchy problems for a class of weakly hyperbolic operators on \(\mathbb {R}^n\). Monatsh Math 192, 1–38 (2020). https://doi.org/10.1007/s00605-020-01372-0
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DOI: https://doi.org/10.1007/s00605-020-01372-0
Keywords
- Fourier integral operator
- Hyperbolic Cauchy problem
- Involutive characteristics
- Global wave-front set
- Propagation of singularities
- Stochastic PDEs