Linear response of one-dimensional liquid $^4$He to external   perturbations
  We study the response of one-dimensional liquid $^4$He to weak perturbations relying on the dynamical structure factor, $S(q,\omega)$, recently obtained via ab-initio techniques [Phys. Rev. Lett. 116, 135302 (2016)]. We evaluate the drag force, $F_v$, experienced by an impurity moving along the system with velocity $v$ and the static response function, $\chi(q)$, describing the density modulations induced by a periodic perturbation with wave vector $q$. 
M. Motta, G. Bertaina, E. Vitali, D.E. Galli, M. Rossi
cond-mat.other