Abstract
Given a Hilbert space \({\mathcal{H}}\), we investigate the well-posedness of the Cauchy problem for the wave equation for operators with a discrete non-negative spectrum acting on \({\mathcal{H}}\). We consider the cases when the time-dependent propagation speed is regular, Hölder, and distributional. We also consider cases when it is strictly positive (strictly hyperbolic case) and when it is non-negative (weakly hyperbolic case). When the propagation speed is a distribution, we introduce the notion of “very weak solutions” to the Cauchy problem. We show that the Cauchy problem for the wave equation with the distributional coefficient has a unique “very weak solution” in an appropriate sense, which coincides with classical or distributional solutions when the latter exist. Examples include the harmonic and anharmonic oscillators, the Landau Hamiltonian on \({\mathbb{R}^n}\), uniformly elliptic operators of different orders on domains, Hörmander’s sums of squares on compact Lie groups and compact manifolds, operators on manifolds with boundary, and many others.
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Communicated by G. Dal Maso
Michael Ruzhansky was supported in parts by the EPSRC Grant EP/K039407/1 and by the Leverhulme Grant RPG-2014-02. Niyaz Tokmagambetov was supported by the MESRK (Ministry of Education and Science of the Republic of Kazakhstan) Grant 0773/GF4. No new data was collected or generated during the course of research.
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Ruzhansky, M., Tokmagambetov, N. Wave Equation for Operators with Discrete Spectrum and Irregular Propagation Speed. Arch Rational Mech Anal 226, 1161–1207 (2017). https://doi.org/10.1007/s00205-017-1152-x
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DOI: https://doi.org/10.1007/s00205-017-1152-x