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Pressure isotropization in high energy heavy ion collisions
Thomas Epelbaum1, François Gelis1
1Institut de Physique Théorique, CEA/Saclay, 91191 Gif sur Yvette Cedex, France.
Physical Review Letters
|January 31, 2014
Summary
Researchers simulated early-stage heavy ion collisions using the color glass condensate model. They observed that increasing the coupling constant rapidly boosts longitudinal pressure compared to transverse pressure in the transient regime.
Area of Science:
- High Energy Physics
- Quantum Chromodynamics
- Nuclear Physics
Background:
- The early stages of high-energy heavy-ion collisions are crucial for understanding the behavior of matter under extreme conditions.
- The color glass condensate (CGC) framework provides a theoretical tool to describe the high-density gluon fields present in these collisions.
Purpose of the Study:
- To investigate the dynamics of the early stages of high-energy heavy-ion collisions within the CGC framework.
- To analyze the pressure anisotropies that develop during the collision evolution.
Main Methods:
- Utilized a real-time classical lattice simulation to model the time evolution of the system.
- Employed the color glass condensate effective field theory.
Main Results:
- Observed a rapid increase in the ratio of longitudinal to transverse pressure as the coupling constant was increased.
- Characterized the transient regime preceding this pressure increase, finding it to be on the order of 1 fm/c.
Conclusions:
- The study demonstrates the sensitivity of pressure anisotropies to the coupling strength in the early universe.
- Real-time lattice simulations are effective in capturing the non-equilibrium dynamics of heavy-ion collisions.
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