Geometries with the second Poincar\'e symmetry
Chao-Guang Huang, Yu Tian, Xiao-Ning Wu, Zhan Xu, and Bin Zhou 1 Institute of High Energy Physics, and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3Institute of Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100190, China, 4 Department of Physics, Tsinghua University, Beijing 100084, China and 5 Department of Physics, Beijing Normal University, Beijing 100875, China.