There’s this weird fluid where the waves on the surface can actually push an object in the opposite direction they're moving.
arXiv · March 17, 2026 · 2603.14195
The Takeaway
Normally, waves on a liquid surface push floating objects along with them in a process called Stokes drift. In these 'odd' fluids, the internal physics breaks standard rules of symmetry, creating an 'anti-Stokes drift' that forces particles to move backward against the flow of the waves.
From the abstract
Capillary waves are a classical free-surface phenomenon in fluid mechanics, yet their behavior in chiral fluids remains largely unexplored. We show that odd viscosity breaks the reciprocity of capillary waves. Using linear theory together with fully nonlinear direct numerical simulations, we find that surface tension creates two inequivalent branches of odd capillary waves: a dispersive branch and a quasi-acoustic branch absent in the capillarity-free limit. Their unequal propagation and attenua