Speaker
Description
Studies of QCD phase transition and critical signals are often conducted under spatially uniform temperature conditions. The influence of spatially varying temperature on the phase transition signals in the fireball at the collider has not yet been fully explored [1].
Based on an Ising-like effective potential, we study the locally equilibrated systems with spatially non-uniform temperature background [2]. In a 2D disk geometry, the low-energy fluctuation spectrum is explicitly resolved into radial and angular momentum modes. The nonlocal correaltions of single eigen-mode exhibits strong anisotropy, which are long-ranged along isotherms but suppressed radially due to the thermal geometry of the system. Unlike homogeneous systems where the zero-momentum mode dominates, correlations in such inhomogeneous system result from the superposition of a series of zero and non-zero angular momentum modes with comparable contributions in the vicinity of the phase transition interface. We extract the angular momentum modes and establish their connection to experimentally observable anisotropic flow. We find azimuthally sensitive observables may offer a previously unexplored avenue for detecting the QCD phase transition.
[1] Jun-Hui Zheng, Lijia Jiang, Phys. Rev. D 104, 016031 (2021).
[2] Lijia Jiang, Tao Yang, Jun-Hui Zheng, arXiv:2603.04923.
