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Quark–gluon plasma (QGP) is an extremely hot, dense state of matter in which quarks and gluons can move through the material rather than remaining bound inside ordinary particles such as protons and neutrons. The early universe passed through a QGP-like phase, and particle colliders can briefly recreate conditions that let scientists study this unusual matter.
What makes quark–gluon plasma different?
In ordinary matter, quarks are confined inside hadrons, including protons and neutrons. Gluons carry the strong interaction that binds quarks together. At sufficiently high temperature and energy density, matter enters a different regime: quarks and gluons are no longer restricted to individual hadrons in the usual way and can move through the plasma.
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That does not mean the particles become a collection of freely moving, non-interacting objects. The strong interaction still matters; CERN describes the early-universe quarks and gluons as weakly bound and able to move independently.
Why “plasma” and “primordial soup”?
A plasma is a state of matter in which its constituents behave differently from those in familiar solids, liquids, or gases. Everyday examples, such as ionized gas, involve atoms and electrons. QGP is different: it concerns quarks and gluons and the strong interaction. “Primordial soup” is a metaphor for the hot, dense matter that existed in the young universe, not a literal liquid.
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In quantum chromodynamics, “color” is the technical name for a type of charge associated with the strong interaction; it does not mean visible color.
How did QGP fit into the early universe?
After the Big Bang, the universe was far hotter and denser than it is today. As it expanded, it cooled. CERN’s early-universe explainer places the aggregation of quarks into protons and neutrons at a few millionths of a second after the Big Bang. Treat that as an approximate timeline, not an exact instant when the same change happened everywhere at once.
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The early universe itself is not observed directly in collider experiments. Instead, scientists study matter produced in collisions and use the results to investigate the behavior of strongly interacting matter under extreme conditions.
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Experiments collide heavy ions—atomic nuclei such as lead or gold—at high energies. The collision can create an extremely hot, dense region that expands and cools very quickly. Detectors then record the particles that emerge. Researchers analyze those particles and their patterns to infer properties of the short-lived matter that existed during the collision.
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- Create extreme conditions: collide heavy-ion nuclei at high energy.
- Let the matter evolve: the hot region expands and cools, and its quarks and gluons eventually form the particles that travel outward.
- Measure the outcome: detectors record those particles; their distributions and correlations provide evidence about the earlier state.
Because the QGP exists only briefly, experiments do not take a direct snapshot of a stable sample. Their conclusions come from measured collision products and the patterns those products preserve.
Where are these experiments conducted?
At CERN’s Large Hadron Collider, ALICE is a detector dedicated to heavy-ion physics and the study of matter at extreme energy density. Brookhaven National Laboratory’s Relativistic Heavy Ion Collider (RHIC) is another facility used to investigate QGP, as described by the US Department of Energy.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do recent smaller-collision results show?
In a July 2026 report, CERN said all four main LHC collaborations reported signs that collisions involving oxygen and neon may create QGP. The wording matters: these are reported signs, and the conclusion is that such collisions may create the plasma. This does not establish that every oxygen or neon collision produces QGP, or that the same conclusion applies to every small collision system.
Results from different colliding nuclei and energies should be compared in context, including which observable is being studied and how strongly the experiment characterizes its conclusion. The reported findings do not provide a single numerical comparison that can be applied across all collision systems.
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How hot is quark–gluon plasma?
The CMS Experiment at CERN describes the relevant temperature as approximately 2,000 billion degrees—about 100,000 times the temperature at the Sun’s core. This is an explanatory approximation from CMS, not a universal temperature for every QGP-producing collision.
Quick Recap
What should a beginner remember?
- QGP is a high-temperature, high-density state of strongly interacting matter in which quarks and gluons are no longer confined inside ordinary hadrons in the usual way.
- The early universe passed through a QGP-like phase; as it cooled, quarks formed protons and neutrons.
- Heavy-ion collisions let researchers briefly create relevant extreme conditions in a laboratory.
- Scientists infer the short-lived state from the particles and correlations measured after the collision fireball expands and cools.
- CERN’s reported oxygen and neon results are signs that these collisions may create QGP, not proof that every such collision does.
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