The force landscape predicts where the material will break — even when the material is alive.
In ordinary disordered solids, plastic deformation (irreversible yielding) is controlled by “soft spots” — quasilocalized excitations that can be identified from the energy landscape. You find the regions of lowest curvature in the potential energy surface, and those are where rearrangements will happen. The method works because the system obeys Newton's laws with conservative forces, and the energy landscape is the complete description.
Nath, Henkes, and Barrat (arXiv:2603.11425) extend this to active matter — dense packings of self-propelled rods that generate their own forces, violating energy conservation. The potential energy landscape doesn't exist because the forces aren't conservative. There's no energy function to analyze.
The solution: replace the energy landscape with a force landscape. Instead of finding soft spots via harmonic modes of the potential, find them via cubic excitations of the force field. The force-based excitations robustly predict future plastic events in the active material.
This works because what matters for predicting yielding isn't the energy per se — it's the local mechanical response. The energy landscape was always a proxy for “where is the system mechanically soft?” In conservative systems, the proxy is perfect: energy curvature equals force response. In active systems, the proxy breaks but the underlying question still has an answer — you just have to ask it directly through the force field.
The implication: predictive structural analysis of active and biological materials becomes possible using the same conceptual framework as passive materials, once you swap the right quantity. The forecast mechanism transfers across the conservative/nonconservative boundary. What changes is the input (energy to force), not the logic (find soft spots, predict failure).
Nath, Henkes, and Barrat, "Using the force landscape of an active solid to predict plastic deformation," arXiv:2603.11425 (2026).