https://doi.org/10.1140/epjc/s10052-022-10000-0
Regular Article - Theoretical Physics
Hard gluon evolution in warming medium
Institute of Physics, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
Received:
12
May
2021
Accepted:
6
January
2022
Published online:
16
January
2022
We describe the energy distribution of hard gluons travelling through a dense quark–gluon plasma whose temperature increases linearly with time, within a probabilistic perturbative approach. The results were applied to the thermalization problem in heavy ion collisions. In the weak coupling picture this thermalization occurs from “the bottom up”: high energy partons, formed early in the collision, radiate low energy gluons which then proceed to equilibrate among themselves, forming a thermal bath that brings the high energy sector to equilibrium. We see that, in this scenario, the dynamic we describe must set in around 
fm/c after the collision in order to reach a fully thermalized state at 
fm/c. We then look at the entropy density and average temperature of the soft thermal bath, as the system approaches (local) thermal equilibrium.
© The Author(s) 2022
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