Nonscattering solutions and blowup at infinity for the critical wave equation
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Abstract
We consider the critical focusing wave equation \((-\partial _t^2+\Delta )u+u^5=0\) in \({\mathbb{R }}^{1+3}\) and prove the existence of energy class solutions which are of the form in the forward lightcone \(\{(t,x)\in {\mathbb{R }}\times {\mathbb{R }}^3: |x|\le t, t\gg 1\}\) where \(W(x)=(1+\frac{1}{3} |x|^2)^{-\frac{1}{2}}\) is the ground state soliton, \(\mu \) is an arbitrary prescribed real number (positive or negative) with \(|\mu |\ll 1\), and the error \(\eta \) satisfies for all \(t\gg 1\). Furthermore, the kinetic energy of \(u\) outside the cone is small. Consequently, depending on the sign of \(\mu \), we obtain two new types of solutions which either concentrate as \(t\rightarrow \infty \) (with a continuum of rates) or stay bounded but do not scatter. In particular, these solutions contradict a strong version of the soliton resolution conjecture.
$$\begin{aligned} u(t,x)=t^\frac{\mu }{2}W(t^\mu x)+\eta (t,x) \end{aligned}$$
$$\begin{aligned} \Vert \partial _t \eta (t,\cdot )\Vert _{L^2(B_t)} +\Vert \nabla \eta (t,\cdot )\Vert _{L^2(B_t)}\ll 1,\quad B_t:=\{x\in {\mathbb{R }}^3: |x|<t\} \end{aligned}$$
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