https://doi.org/10.1051/epjconf/202429613003
Study of a longitudinally expanding plasma with the 2PI effective action
Institut de Physique Théorique, CEA/Saclay, Université Paris-Saclay, 91191 Gif sur Yvette, France
* e-mail: sigtryggur.hauksson@ipht.fr
Published online: 26 June 2024
A central question in heavy-ion collisions is how the initial far-from-equilibrium medium evolves and thermalizes while it undergoes a rapid longitudinal expansion. In this work we use the two-particle irreducible (2PI) effective action for the first time to consider this question, focusing on ϕ4 scalar theory truncated at three loops. We calculate the momentum distribution of quasiparticles in the medium and show that isotropization takes place. We furthermore consider the thermal mass of quasiparticles and the importance of number-changing processes.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
