A semi-linear shifted wave equation on the hyperbolic spaces with application on a quintic wave equation on $\mathbb {R}^2$
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- by Ruipeng Shen and Gigliola Staffilani PDF
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Abstract:
In this paper we consider a semi-linear, defocusing, shifted wave equation on the hyperbolic space \[ \partial _t^2 u - (\Delta _{{\mathbb H}^n} + \rho ^2) u = - |u|^{p-1} u, \quad (x,t)\in {\mathbb H}^n \times {\mathbb R}, \] and we introduce a Morawetz-type inequality \[ \int _{-T_-}^{T_+} \int _{{\mathbb H}^n} |u|^{p+1} d\mu dt < C \mathcal E, \] where $\mathcal E$ is the energy. Combining this inequality with a well-posedness theory, we can establish a scattering result for solutions with initial data in $H^{1/2,1/2} \times H^{1/2,-1/2}({\mathbb H}^n)$ if $2 \leq n \leq 6$ and $1<p<p_c = 1+ 4/(n-2)$. As another application we show that a solution to the quintic wave equation $\partial _t^2 u - \Delta u = - |u|^4 u$ on ${\mathbb R}^2$ scatters if its initial data are radial and satisfy the conditions \[ |\nabla u_0 (x)|, |u_1 (x)| \leq A(|x|+1)^{-3/2-\varepsilon },\quad |u_0 (x)| \leq A(|x|)^{-1/2-\varepsilon },\quad \varepsilon >0. \]References
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Additional Information
- Ruipeng Shen
- Affiliation: Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
- Address at time of publication: Department of Mathematics and Statistics, McMaster University, 1280 Main Street, Hamilton, Ontario L8S 4K1, Canada
- Email: srpgow@gmail.com
- Gigliola Staffilani
- Affiliation: Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
- MR Author ID: 614986
- Received by editor(s): February 25, 2014
- Received by editor(s) in revised form: June 10, 2014
- Published electronically: March 24, 2015
- Additional Notes: The second author was funded in part by NSF DMS 1068815.
- © Copyright 2015 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 368 (2016), 2809-2864
- MSC (2010): Primary 35L71; Secondary 35L05
- DOI: https://doi.org/10.1090/S0002-9947-2015-06513-1
- MathSciNet review: 3449259