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On multi-solitons for the energy-critical wave equation in dimension 5

In this paper, we construct $K$-solitons of the focusing energy-critical nonlinear wave equation in five-dimensional space, i.e. solutions $u$ of the equation such that \begin{equation*} \|\nabla_{t,x}u(t)-\nabla_{t,x}\big(\sum_{k=1}^{K}W_{k}(t)\big)\|_{L^{2}}\to 0\quad \mathrm{as}\ t\to \infty, \end{equation*} where for any $k\in \{1,\dots,K\}$, $W_{k}$ is Lorentz transform of the explicit standing soliton $W(x)=(1+|x|^{2}/15)^{-3/2}$, with any speed $\boldsymbol{\ell}_{k}\in \mathbb{R}^{5}$ ,$|\boldsymbol{\ell}_{k}|<1$ ($\boldsymbol{\ell}_{k'}\ne \boldsymbol{\ell}_{k}$ for $k'\ne k$) satisfying an explicit smallness condition.