Limiting attractors in heavy-ion collisions
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866908417522663424 |
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| author | Boguslavski, Kirill Kurkela, Aleksi Lappi, Tuomas Lindenbauer, Florian Peuron, Jarkko |
| author_facet | Boguslavski, Kirill Kurkela, Aleksi Lappi, Tuomas Lindenbauer, Florian Peuron, Jarkko |
| contents | 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 viscosity-related relaxation time scale $τ_R$, 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 $τ_{\text{BMSS}} = α_s^{-13/5}/Q_s$. 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 $\hat q^{yy} / \hat q^{zz}$ and $κ_T/κ_z$. We also provide parametrizations for these ratios for phenomenological studies of pre-equilibrium effects on jets and heavy quarks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_11252 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Limiting attractors in heavy-ion collisions Boguslavski, Kirill Kurkela, Aleksi Lappi, Tuomas Lindenbauer, Florian Peuron, Jarkko High Energy Physics - Phenomenology Nuclear Theory 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 viscosity-related relaxation time scale $τ_R$, 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 $τ_{\text{BMSS}} = α_s^{-13/5}/Q_s$. 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 $\hat q^{yy} / \hat q^{zz}$ and $κ_T/κ_z$. We also provide parametrizations for these ratios for phenomenological studies of pre-equilibrium effects on jets and heavy quarks. |
| title | Limiting attractors in heavy-ion collisions |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2312.11252 |