# Matching of nonthermal initial conditions and hydrodynamic stage in ultrarelativistic heavy-ion collisions

Source: [Matching of nonthermal initial conditions and hydrodynamic stage in ultrarelativistic heavy-ion collisions](<https://www.sota2.com/research/paper/68fa29731e209131ce833c3b>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:53:03.474Z

Authors: S.V. Akkelin, Yu.M. Sinyukov

Published: 2009-12-21T14:53:09.000Z

## Abstract

A simple approach is proposed allowing actual calculations of the preequilibrium dynamics in ultrarelativistic heavy-ion collisions to be performed for a far-from-equilibrium initial state. The method is based on the phenomenological macroscopic equations that describe the relaxation dynamics of the energy-momentum tensor and are motivated by Boltzmann kinetics in the relaxation-time approximation. It gives the possibility to match smoothly a nonthermal initial state to the hydrodynamics of the quark gluon plasma. The model contains two parameters, the duration of the prehydrodynamic stage and the initial value of the relaxation-time parameter, and allows one to assess the energy-momentum tensor at a supposed time of initialization of the hydrodynamics.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0912.4180>)

[PDF](<https://arxiv.org/pdf/0912.4180.pdf>)