DiffPhD: A Unified Differentiable Solver for Projective Heterogeneous Materials in Elastodynamics with Contact-Rich GPU-Acceleration. - Shih-Yu Lai; Sung-Han Tien; Jui-I Huang; Yen-Chen Tseng; Yi-Ting Chiu; Siyuan Luo; Ziqiu Zeng; Fan Shi 002; Peter Yichen Chen; Tiantian Liu; Yu-Lun Liu; Bing-Yu Chen 004 (CoRR, 2026)