CERN Produces Quark-Gluon Plasma in Tiny Collisions, Creating “Micro Big Bang” Experiments

Physicists at the European Organization for Nuclear Research (CERN) have shown that quark-gluon plasma (QGP)—the ultra-hot, dense state of matter that filled the universe a microsecond after the big bang—can be generated in collisions far smaller than those previously required. By smashing light particles together at near-light speed, the team created a “micro big bang” that reproduces the primordial plasma without the need for heavy nuclei such as lead.

Wired Magazine

For decades, particle colliders have replicated QGP only by colliding large atomic nuclei, which generate enough energy to melt protons and neutrons into a fluid-like plasma. Quarks, the constituents of protons and neutrons, and gluons, the carriers that bind them, existed freely in this early-universe soup. As the cosmos expanded and cooled, quarks combined into the familiar building blocks of matter. CERN’s new approach tests how far the size of the colliding system can be reduced while still yielding a fluid-like QGP droplet.

Wired Magazine

Because natural sources of QGP no longer exist, laboratory recreations are the sole window into the universe’s first microseconds. Demonstrating that tiny collisions can produce a plasma that behaves like a fluid expands experimental possibilities: researchers can conduct more frequent, less resource-intensive studies, probe the limits of QGP formation, and refine models of how the early universe transitioned from a quark-gluon sea to the atoms that compose today’s matter.

Wired Magazine

The success of these miniature collisions opens a pathway for systematic investigations into the properties of QGP at previously inaccessible scales. Ongoing work will explore the precise conditions under which the plasma forms, how its fluid characteristics evolve, and what this reveals about the fundamental forces that shaped the cosmos in its infancy.

Wired Magazine