Abstract
We study the linear wave equation □gu = 0 in Bondi-Sachs coordinates, for an asymptotically flat Lorentz metric g. We consider the null-timelike boundary problem, where an initial value is given on the null surface τ = 0 and a boundary value on the timelike surface r = r0. We obtain spacetime Hp-estimates of ru for r > r0 and derive an asymptotic expansion of ru in terms of 1/r as r → ∞.
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Acknowledgements
The first author was supported by National Science Foundation of USA (Grant No. DMS-1404596). The second author was supported by National Natural Science Foundation of China (Grant No. 11571019). The authors thank Xiao Zhang for many helpful discussions.
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Han, Q., Zhang, L. Asymptotics for null-timelike boundary problems for general linear wave equations. Sci. China Math. 64, 111–128 (2021). https://doi.org/10.1007/s11425-018-9492-6
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DOI: https://doi.org/10.1007/s11425-018-9492-6