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- W3097619126 abstract "We consider an abstract wave equation with a propagation speed that depends only on time. We investigate well-posedness results with finite derivative loss in the case where the propagation speed is smooth for positive times, but potentially singular at the initial time. We prove that solutions exhibit a finite derivative loss under a family of conditions that involve the blow up rate of the first and second derivative of the propagation speed, in the spirit that the weaker is the requirement on the first derivative, the stronger is the requirement on the second derivative. Our family of conditions interpolates between the two limit cases that were already known in the literature. We also provide the counterexamples that show that, as soon as our conditions fail, solutions can exhibit an infinite derivative loss. The existence of such pathologies was an open problem even in the two extreme cases." @default.
- W3097619126 created "2020-11-09" @default.
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- W3097619126 date "2021-02-01" @default.
- W3097619126 modified "2023-10-16" @default.
- W3097619126 title "Finite vs infinite derivative loss for abstract wave equations with singular time-dependent propagation speed" @default.
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- W3097619126 doi "https://doi.org/10.1016/j.bulsci.2020.102918" @default.
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