A Compact Non-convex Ancient Curve Shortening Flow
arXiv:2204.05978
Abstract
An example of a compact, non-convex, embedded ancient solution for the curve shortening flow, which is asymptotic to Yin-Yang curve, is constructed.
The same result was obtained independently by Angenent S., Khan I., Olson C., Zhang Y. in arXiv:2204.05253