Knot Visualization Experiments for Verifiable Molecular Movies

Classical topological concepts are applied to understand high performance computing simulations of molecules writhing in three dimensional space. These simulations produce peta-bytes of floating point data, to describe 3 dimensional changes in molecular structure. A zero-th order analysis is achieved by viewing a computer animation synchronized with these changes. The performance demands for animation of this voluminous data can become problematic, but techniques from low-dimensional topology are helpful. The 3D molecule is reduced to a lower dimensional model of a 1-manifold, which undergoes a piecewise linear approximation for animation. An example is presented here to show how a 1-manifold and its PL approximation could come to have different embeddings as molecular writhing proceeds. This should serve as a cautionary warning to animators to respect established sufficient conditions for topological preservation so that the movies generated will faithfully reflect the topology of the underlying model. To obtain this result, techniques from low-dimensional topology were joined with experimental mathematics and numerical analyses.