Attractors for Flow Observables in 2+1D Bjorken Flow
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910774406938624 |
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| author | Ambruş, Victor E. Schlichting, Sören Werthmann, Clemens |
| author_facet | Ambruş, Victor E. Schlichting, Sören Werthmann, Clemens |
| contents | We examine the capabilities of second-order Israel-Stewart-type hydrodynamics to capture the early-time behaviour of the quark-gluon plasma created in heavy-ion collisions. We point out that at very early times, the dynamics of the fireball is governed by the local 0+1-D Bjorken flow attractor due to the rapid expansion along the longitudinal direction. Discrepancies between hydrodynamics and kinetic theory in this far-from-equilibrium regime leads to disagreement at the level of late-time observables, such as elliptic flow. We show that rescaling the initial energy-density profile for hydrodynamics accounts for such discrepancies, restoring agreement with kinetic theory for large opacities (small shear viscosity / large system size / high energy). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_10618 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Attractors for Flow Observables in 2+1D Bjorken Flow Ambruş, Victor E. Schlichting, Sören Werthmann, Clemens Nuclear Theory High Energy Physics - Phenomenology Fluid Dynamics We examine the capabilities of second-order Israel-Stewart-type hydrodynamics to capture the early-time behaviour of the quark-gluon plasma created in heavy-ion collisions. We point out that at very early times, the dynamics of the fireball is governed by the local 0+1-D Bjorken flow attractor due to the rapid expansion along the longitudinal direction. Discrepancies between hydrodynamics and kinetic theory in this far-from-equilibrium regime leads to disagreement at the level of late-time observables, such as elliptic flow. We show that rescaling the initial energy-density profile for hydrodynamics accounts for such discrepancies, restoring agreement with kinetic theory for large opacities (small shear viscosity / large system size / high energy). |
| title | Attractors for Flow Observables in 2+1D Bjorken Flow |
| topic | Nuclear Theory High Energy Physics - Phenomenology Fluid Dynamics |
| url | https://arxiv.org/abs/2302.10618 |