Radial Attention: \ mathcalO brace (n\ log n) Sparse Attention with Energy Decay for Long Video Generation - LI, XINGYANG; Li, Muyang; Cai, Tianle; Xi, Haocheng; Yang, Shuo; Lin, Yujun; Zhang, Lvmin; Yang, Songlin; Hu, Jinbo; Peng, Kelly; Agrawala, Maneesh; Stoica, Ion; et al. (Advances in Neural Information Processing Systems, 2025)