Taotao Qiu, Yi-Fu Cai, Yang Liu, Siyu Li, Jarah Evslin, Xinmin Zhang
Abstract The recently released data of DESI DR2 favors a dynamical dark energy theory, with the equation of state crossing the cosmological constant boundary w = −1. In this paper, we briefly review quintom cosmology, especially the quintom bounce. We will give three examples of a quintom bounce and one example of a cyclic universe with quintom matter.