Observation of Gapless Spectral Flows in Elastic Metamaterials with Synthetic DimensionRemoveYue Shen, Linyun Yang, Zhi-Kang Lin, Kailun Wang, Xiang Li, Liang Li, Ying Wu, and Jian-Hua JiangPhys. Rev. Lett. 135, 256601 (2025)