Work

Pseudorapidity dependent hydrodynamic response in heavy-ion collisions

Year: 2020

Type: article

Abstract: We propose a differential hydrodynamic response relation, V 2 ( ζ ) = ∫ d ξ G ( ζ − ξ ) E 2 ( ξ ) , to describe the formation of a pseudorapidity dependent elliptic flow in heavy-ion collisions, in response to a fluctuating three-dimensional initial density profile. By analyzing the medium expansion using event-by-event simulations of 3+1D MUSIC, with initial conditions generated via the AMPT model, the differential response relation is verified. Given the response relation, we are able to separate the two-point correlation of elliptic flow in pseudorapidity into fluid response and two-point correlation of initial eccentricity. The fluid response contains information of the speed of sound and shear viscosity of the medium. From the pseudorapidity dependent response relation, a finite radius of convergence of the hydrodynamic gradient expansion is obtained with respect to realistic fluids in heavy-ion collisions.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2020.135248

Authors: Hui Li, Li Yan

Institution: Fudan University

Language: English

Topic: High-Energy Particle Collisions Research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: National Natural Science Foundation of China, China Postdoctoral Science Foundation, Aerostatic Science Foundation

Awards: G2609558481, G6751356864