The Cosmic Angular-Momentum Field: From Primordial Origins to Cosmological Probes
Speaker: Mingjie Sheng (Xiamen University)
Abstract:
Angular momentum is a fundamental property of cosmic structures, spanning scales from the cosmic filaments and dark matter halos to galaxies. Its origin and evolution encode information about primordial initial conditions and the subsequent formation of cosmic structures. In this talk, I will explore the cosmic angular-momentum field from theoretical, numerical, and observational perspectives. I will revisit how angular momentum is seeded by large‑scale tidal perturbations and shaped by subsequent non‑linear evolution, and recent observational detections of primordial tidal-torque imprints in galaxy spins. Finally, I will discuss future prospects for exploiting galaxy angular momentum as a cosmological probe, including incorporating spin information into the reconstruction of primordial initial conditions and probing fundamental physics through galaxy spin statistics, such as parity violation and other cosmological signals.