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Pre-hydrodynamic evolution and its signatures in final-state heavy-ion observables
- Source :
- Phys. Rev. C 103, 054906 (2021)
- Publication Year :
- 2020
-
Abstract
- We investigate the effects of pre-hydrodynamic evolution on final-state observables in heavy-ion collisions using state-of-the art event simulations coupled to different pre-hydrodynamic scenarios, which include the recently-developed effective kinetic transport theory evolution model KoMPoST. Flow observables are found to be insensitive to the details of pre-hydrodynamic evolution. The main effect we observe is in the $p_T$ spectra, particularly the mean transverse momentum. However, at least part of this effect is a consequence of the underlying conformal invariance assumption currently present in such approaches, which is known to be violated in the temperature regime probed in heavy-ion collisions. This assumption of early time conformal invariance leads to an artificially large out-of-equilibrium bulk pressure when switching from (conformal) pre-hydrodynamic evolution to hydrodynamics (using the non-conformal QCD equation of state), which in turn increases the transverse momentum. Our study indicates that a consistent treatment of pre-hydrodynamic evolution in heavy-ion collisions requires the use of non-conformal models of early time dynamics.<br />Comment: 17 pages, 15 figures, 1 appendix
- Subjects :
- Nuclear Theory
High Energy Physics - Phenomenology
Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. C 103, 054906 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2006.02324
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevC.103.054906