Asymptotics and Scattering for Critically Weakly Hyperbolic and Singular Systems
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| Format: | Preprint |
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2025
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| author | Sabitbek, Bolys Shao, Arick |
| author_facet | Sabitbek, Bolys Shao, Arick |
| contents | We study a very general class of first-order linear hyperbolic systems that both become weakly hyperbolic and contain lower-order coefficients that blow up at a single time $t = 0$. In "critical" weakly hyperbolic settings, it is well-known that solutions lose a finite amount of regularity at the degenerate time $t = 0$. In this paper, we both improve upon the results in the weakly hyperbolic setting, and we extend this analysis to systems containing critically singular coefficients, which may also exhibit significantly modified asymptotics at $t = 0$.
In particular, we give precise quantifications for (1) the asymptotics of solutions as $t$ approaches $0$; (2) the scattering problem of solving the system with asymptotic data at $t = 0$; and (3) the loss of regularity due to the degeneracies at $t = 0$. Finally, we discuss a variety of applications for these results, including to weakly hyperbolic and singular wave equations, equations of higher order, and equations arising from relativity and cosmology, e.g. at big bang singularities. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_11348 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Asymptotics and Scattering for Critically Weakly Hyperbolic and Singular Systems Sabitbek, Bolys Shao, Arick Analysis of PDEs General Relativity and Quantum Cosmology 35L80 (Primary), 35L81 (Primary), 35B40 (Secondary), 35L40 (Secondary), 35A24 (Secondary), 35L05 (Secondary), 35Q75 (Secondary) We study a very general class of first-order linear hyperbolic systems that both become weakly hyperbolic and contain lower-order coefficients that blow up at a single time $t = 0$. In "critical" weakly hyperbolic settings, it is well-known that solutions lose a finite amount of regularity at the degenerate time $t = 0$. In this paper, we both improve upon the results in the weakly hyperbolic setting, and we extend this analysis to systems containing critically singular coefficients, which may also exhibit significantly modified asymptotics at $t = 0$. In particular, we give precise quantifications for (1) the asymptotics of solutions as $t$ approaches $0$; (2) the scattering problem of solving the system with asymptotic data at $t = 0$; and (3) the loss of regularity due to the degeneracies at $t = 0$. Finally, we discuss a variety of applications for these results, including to weakly hyperbolic and singular wave equations, equations of higher order, and equations arising from relativity and cosmology, e.g. at big bang singularities. |
| title | Asymptotics and Scattering for Critically Weakly Hyperbolic and Singular Systems |
| topic | Analysis of PDEs General Relativity and Quantum Cosmology 35L80 (Primary), 35L81 (Primary), 35B40 (Secondary), 35L40 (Secondary), 35A24 (Secondary), 35L05 (Secondary), 35Q75 (Secondary) |
| url | https://arxiv.org/abs/2506.11348 |