The Liouville theorem for a class of Fourier multipliers and its connection to coupling
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Contributors
Abstract
The classical Liouville property says that all bounded harmonic functions in (Formula presented.), that is, all bounded functions satisfying (Formula presented.), are constant. In this paper, we obtain necessary and sufficient conditions on the symbol of a Fourier multiplier operator (Formula presented.), such that the solutions (Formula presented.) to (Formula presented.) are Lebesgue a.e. constant (if (Formula presented.) is bounded) or coincide Lebesgue a.e. with a polynomial (if (Formula presented.) is polynomially bounded). The class of Fourier multipliers includes the (in general non-local) generators of Lévy processes. For generators of Lévy processes, we obtain necessary and sufficient conditions for a strong Liouville theorem where (Formula presented.) is positive and grows at most exponentially fast. As an application of our results above, we prove a coupling result for space-time Lévy processes.
Details
Original language | English |
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Pages (from-to) | 2374 - 2394 |
Number of pages | 21 |
Journal | Bulletin of the London Mathematical Society |
Volume | 56 |
Issue number | 7 |
Publication status | Published - Jul 2024 |
Peer-reviewed | Yes |
External IDs
Scopus | 85192534826 |
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