Thermalization time first decreases then increases with environment coupling.

Physicists want to know how fundamental particles and the forces between them behave when exposed to a hot environment. Most earlier work focused on simpler, Abelian forces rather than complex non-Abelian forces like those that bind quarks inside protons. In this paper, researchers modeled a quark and an antiquark linked by a string of energy, placed inside a hot thermal bath. They simulated this open system using a computational tool called tensor networkstensor networksA computational method to simulate complex quantum systems by breaking them into manageable pieces.. The hot bath melts the connecting string by spreading out the color charges and screening the energy flux. If the system is on resonance, this melting delays the usual clean snapping of the string. Weak bath coupling speeds up heat-up time, but strong coupling slows it down. The model also favors bound pairs over free charges.

Why it matters

This helps physicists understand how particles like quarks and gluons behave in hot environments, such as in the early universe. It shows that non-Abelian gauge theories have distinct thermalization patterns that affect predictions for particle physics.

Questions answered