学术报告（2026年4月14日10:00）：Cosmological correlators using tensor networks

主持人：李文亮 教授

报告简介：In this talk, I will introduce a nonperturbative tensor network framework for computing cosmological observables in a controlled lattice realization of interacting QFT in 2d de Sitter spacetime. I will use this framework to test the recent proposal that suitably defined in-in correlators can be obtained from an in-out formalism by gluing the expanding and contracting Poincare patches. I will report nonperturbative evidence for the proposed equivalence in phi-4 theory in both heavy and light field regimes, and comment on regulator subtleties associated with the singular behavior near the patching surface. I will also comment on various extensions of this numerical framework.

报告人简介：Xinan Zhou is a faculty member at the Kavli Institute for Theoretical Sciences (UCAS) and the recipient of the 2023 ICTP Prize. His research focuses on high energy physics, particularly the AdS/CFT correspondence, conformal bootstrap, scattering amplitudes, and quantum gravity. He received his undergraduate degree from the University of Science and Technology of China and earned his PhD from the C. N. Yang Institute for Theoretical Physics at Stony Brook University in 2018. Prior to his current role, he was a postdoctoral fellow at the Princeton Center for Theoretical Science from 2018 to 2021.