Neutron scattering and ab initio simulation: two essential and inseparable tools for studying liquids dynamics. The case of shear waves in silver.

The propagation of compression waves in a liquid is a well-established phenomenon, responsible for the travelling of sound in it. More debated is the case of shear waves, which are in principle not allowed to propagate in an ideal liquid. This is an important issue relating to the innermost nature of the liquid state. We therefore decided to combine neutron and numerical techniques to examine the existence of shear excitations in liquid silver and the conditions under which it is possible to detect them