Shear stress relaxation and diffusion in simple liquids by molecular dynamics simulations: analytic expressions and paths to viscosity D.M. Heyes, ∗ E.R. Smith b , ‡ and D. Dini § Department of Mechanical Engineering, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, United Kingdom. (Dated: April 11, 2019) b and : Department of Mechanical and Aerospace Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom. 1