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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Particle colliders do not recreate the Big Bang or the expanding universe. In high-energy collisions, they produce a tiny, short-lived fireball of matter that can enter a state called quark–gluon plasma (QGP), associated with the universe’s first few millionths of a second. Researchers infer what that plasma was like from the particles it leaves behind.
What is quark–gluon plasma?
Ordinary matter is made of atoms, whose nuclei contain protons and neutrons. Those particles, in turn, contain quarks bound together by gluons, the carriers of the strong interaction. Under extreme temperature and density, quarks and gluons can become deconfined: instead of remaining bound inside individual protons and neutrons, they form a hot, dense medium known as quark–gluon plasma.
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This state is associated with the early universe, shortly after the Big Bang, before the universe cooled enough for quarks and gluons to bind into hadrons. ATLAS describes the laboratory goal as recreating and studying the high-energy-density conditions in which matter formed from free quarks and gluons—not reproducing the universe itself. ATLAS explains the connection between QGP and the early universe.
How do colliders make it?
- Accelerate nuclei. Researchers send fully ionised heavy atoms, such as lead or gold nuclei, toward one another at very high energy. “Heavy ions” means the atoms have been stripped of their electrons; the colliding objects are their nuclei. CERN describes head-on heavy-ion collisions as a way to create the necessary extreme conditions. CERN’s heavy-ion overview and ATLAS’s QGP feature outline the process.
- Create a fireball. Where the nuclei overlap, their energy produces an extremely hot and dense region. For a brief moment, conditions can be sufficient for quarks and gluons to form QGP rather than remain confined inside ordinary hadrons.
- Let it expand and cool. The fireball expands rapidly. As it cools, quarks and gluons recombine into hadrons, including pions, kaons, protons and neutrons. These particles stream outward and reach the detectors.
- Reconstruct what happened. Detectors measure the outgoing particles’ identities, directions, energies and correlations. Physicists use those measurements to infer how the short-lived medium affected them; they do not directly inspect a surviving sample of plasma. CMS’s explanation of how matter formed describes the transition back to particles.
How can scientists study something that disappears so quickly?
The plasma is gone before a detector could capture it as an object. Instead, researchers compare patterns in the particles that emerge from collisions. A signal is more persuasive when multiple measurements, taken in different ways or collision systems, point to a consistent picture. No single signature is a photograph of QGP; each is evidence about the medium and its effects.
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Jet quenching and energy loss
A high-energy quark or gluon can produce a spray of particles called a jet. If it travels through QGP, it may lose energy to the medium. Researchers examine how much energy is lost and how the jet’s direction and composition change. More central collisions—those in which the nuclei overlap more—can create a larger plasma volume and stronger energy loss. CERN discusses jet quenching in its heavy-ion overview.
Strange-particle production
Patterns in the production of particles containing strange quarks can also help diagnose the conditions in a collision. ATLAS describes enhanced production of strange quarks and multi-strange antibaryons as evidence associated with QGP formation. For historical context, an ATLAS feature reports that the NA57 experiment found yields of hadrons made entirely from newly created quarks reaching 15–20 times the expected yield in 2006, compared with a proton–proton reference system. That result belongs to NA57, as reported by ATLAS; it is not an ATLAS measurement. ATLAS’s feature discusses the result and the broader diagnostic.
Collective flow
The initial overlap of two nuclei is not always round. Pressure gradients in the fireball can drive collective expansion, leaving an anisotropic pattern in the directions of the final particles. Measuring this elliptic or other anisotropic flow helps researchers constrain how the medium evolved and estimate properties such as its viscosity. ATLAS describes flow as one way to study the plasma’s behaviour. Read ATLAS’s account of QGP measurements.
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Suppression across collision systems
Researchers can compare particle yields in heavy-ion collisions with yields from smaller or simpler systems. A reduced yield may point to energy loss or other effects, but its interpretation depends on what is compared and how alternative explanations are addressed. In discussing light-ion measurements, CERN notes that ALICE used comparisons designed to examine other possible mechanisms as well. CERN’s report on oxygen collisions describes this kind of evidence.
What do temperature figures mean?
Temperature and energy-density figures are tied to particular definitions, experiments or historical accounts; they are not one universal measurement for every collider-produced QGP.
- About 2 terakelvin, or about 160 MeV: ATLAS gives these approximate values for the Hagedorn temperature, a historical concept describing a limit beyond which ordinary hadronic matter is unstable. They should not be read as the measured temperature of every plasma created at a collider. ATLAS provides the context.
- About 3 GeV per cubic femtometre and about 235 MeV: A legacy NA49/CERN account gives these approximate early energy density and temperature figures for an SPS heavy-ion fireball and estimates its density at about 20 times that of normal matter. These are older SPS-era figures, not current LHC measurements. The NA49 account provides this historical context.
- About 100,000 times the Sun’s core temperature: CMS uses this as an illustrative comparison for the transition temperature in its explainer. It is not a new 2026 measurement. See CMS’s explanation.
Are smaller collisions relevant too?
Heavy-ion collisions remain the established way to make and study large QGP fireballs, but evidence is expanding to smaller collision systems. CERN reported on 24 July 2026 that ALICE, ATLAS, CMS and LHCb each reported signs of QGP originating from LHC oxygen collisions; the collaborations also reported multiple signs in oxygen–oxygen and neon–neon collisions. The report describes an ATLAS jet-pair imbalance that grows in more central collisions, CMS charged-particle suppression relative to proton–proton collisions, ALICE evidence for parton energy loss, and suppression of some heavy-quark bound states. Some results are preliminary, and the interpretation of QGP formation in light-ion collisions remains an active area of study. CERN’s 2026 account details the reported findings.
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These observations do not establish that every small-system collision creates a medium equivalent to the QGP in a large heavy-ion collision. Collision species, energy, overlap and fireball size matter, as does the particular observable being measured. Evidence from jets, particle yields, flow or bound-state suppression is not interchangeable; each constrains a different part of the picture.
Does a collider recreate the early universe?
Only in a carefully limited sense. A collider can create a microscopic sample of matter in a state associated with the early universe and measure how that sample behaves. It does not reproduce the universe’s scale, cosmological expansion or full history. The laboratory fireball expands and cools quickly, but it is not the expanding universe. The early-universe connection is about the state of matter and the conditions under which quarks and gluons were free, not a miniature Big Bang.
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