Limiting attractors in heavy-ion collisions
Abstract
We study universal features of the hydrodynamization process in heavy-ion collisions using QCD kinetic theory simulations for a wide range of couplings. We introduce the new concept of limiting attractors, which are obtained by extrapolation to vanishing and strong couplings. While the hydrodynamic limiting attractor emerges at strong couplings and is governed by the viscosityrelated relaxation time scale τR, we identify a bottom-up limiting attractor at weak couplings. It corresponds to the late stages of the perturbative bottom-up thermalization scenario and exhibits isotropization on the time scale τBMSS = α −13/5 s /Qs. In contrast to hydrodynamic limiting attractors, at finite couplings the bottom-up limiting attractor provides a good universal description of the pre-hydrodynamic evolution of jet and heavy-quark momentum broadening ratios ˆq yy/qˆ zz and κT /κz. We also provide parametrizations for these ratios for phenomenological studies of preequilibrium effects on jets and heavy quarks.
Main Authors
Format
Articles
Research article
Published
2024
Series
Subjects
Publication in research information system
Publisher
Elsevier
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202404122861Use this for linking
Review status
Peer reviewed
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2024.138623
Language
English
Published in
Physics Letters B
Citation
- Boguslavski, K., Kurkela, A., Lappi, T., Lindenbauer, F., & Peuron, J. (2024). Limiting attractors in heavy-ion collisions. Physics Letters B, 852, Article 138623. https://doi.org/10.1016/j.physletb.2024.138623
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Funder(s)
Research Council of Finland
Research Council of Finland
European Commission
Funding program(s)
Academy Project, AoF
Centre of Excellence, AoF
RIA Research and Innovation Action, H2020
Akatemiahanke, SA
Huippuyksikkörahoitus, SA
RIA Research and Innovation Action, H2020
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can be held responsible for them.
Additional information about funding
This work was supported under the European Union’s Horizon 2020 research and innovation by the STRONG-2020 project (grant agreement No. 824093) and by the European Research Council under project ERC-2018-ADG-835105 YoctoLHC. The content of this article does not reflect the official opinion of the European Union and responsibility for the information and views expressed therein lies entirely with the authors. This work was funded in part by the Knut and Alice Wallenberg foundation, contract number 2017.0036. T.L has been supported by the Academy of Finland, by the Centre of Excellence in Quark Matter (project 346324) and project 321840. K.B. and F.L. are supported by the Austrian Science Fund (FWF) under project P 34455, and F.L. additionally by the Doctoral Program W1252- N27 Particles and Interactions. The authors wish to acknowledge the CSC – IT Center for Science, Finland, and the Vienna Scientific Cluster (VSC) project 71444 for computational resources. They also acknowledge the grants of computer capacity from the Finnish Grid and Cloud Infrastructure (persistent identifier urn:nbn:fi:research-infras-2016072533 ).
Copyright© 2024 the Authors