Universality of energy-momentum response in kinetic theories

被引：5
|
作者：
Du, Xiaojian [1 ,2 ]
Ochsenfeld, Stephan [2 ]
Schlichting, Soeren [2 ]
机构：
[1] Univ Santiago Compostela, Inst Galego Fis Altas Enerxias IGFAE, E-15782 Galicia, Spain
[2] Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany
来源：
PHYSICS LETTERS B | 2023年 / 845卷
基金：
欧洲研究理事会;
关键词：
D O I：
10.1016/j.physletb.2023.138161
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the response of the energy-momentum tensor in several kinetic theories, from the simple relaxation time approximation (RTA) to Quantum Chromodynamics (QCD). Irrespective of the differences in microscopic properties, we find a remarkable degree of universality in the response functions from conformal theories. We find that the response to scalar perturbations in kinetic theory can be effectively described by a pair of one hydrodynamic sound mode and one non-hydrodynamic mode. We find that even beyond the range of validity of hydrodynamics, the energy-momentum response in position space can be effectively described by one single mode with non-trivial dispersion relation and residue. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.
引用
收藏
页数：8
相关论文
共 50 条
12345