Dynamics of Quark-Gluon Plasma in Heavy-Ion Collisions
Summary
The quark-gluon plasma (QGP) is a state of matter in which quarks and gluons, normally confined within hadrons, become deconfined under extreme temperature and density conditions. Such conditions are recreated in terrestrial experiments by colliding heavy nuclei at relativistic energies. In the aftermath of these collisions, a rapidly expanding fireball forms, exhibiting collective behaviour that can be described by relativistic hydrodynamics. Key observables include azimuthal anisotropies (flow coefficients), which probe the medium’s viscosity and equation of state, and high-momentum jets, whose energy loss and modification as they traverse the plasma reveal microscopic transport properties and colour coherence effects. The interplay between experimental measurements and theoretical frameworks—from perturbative quantum chromodynamics to strong-coupling approaches—has established a quantitative picture of QGP viscosity, thermalisation time and screening lengths. This research carries global significance by shedding light on the early universe microseconds after the Big Bang and by advancing our understanding of QCD under extreme conditions, with potential implications for astrophysical phenomena such as neutron-star mergers.
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Dynamics of Quark-Gluon Plasma in Heavy-Ion Collisions publication trend
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Technical terms
Quark-Gluon Plasma (QGP): A deconfined phase of quarks and gluons formed at extreme temperature or density.
Heavy-Ion Collision: A high-energy encounter between nuclei (such as Pb–Pb) that produces conditions necessary for QGP formation.
Parton: A constituent quark or gluon inside a hadron, treated as the fundamental degrees of freedom in high-energy processes.
Jet Quenching: The phenomenon of energy loss by high-momentum partons as they traverse the QGP, leading to modified jet substructure and suppression of high-pT hadrons.
Energy Correlator: A multi-point correlation function of energy flow operators within a jet, used to probe angular and dynamical features of QCD radiation in vacuum and in medium.
Hydrodynamic Flow: Collective expansion of the QGP described by fluid dynamics, characterised by anisotropic flow coefficients (vn) that reflect initial geometry and medium viscosity.
References
- Analyzing N-Point Energy Correlators inside Jets with CMS Open Data. Physical Review Letters (2023).
- Jet substructure observables for jet quenching in quark gluon plasma: A machine learning driven analysis. SciPost Physics (2024).
- A coherent view of the quark-gluon plasma from energy correlators. Journal of High Energy Physics (2023).
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