In its formative moments, the Universe existed as a hot and dense mixture of quarks and gluons, often referred to as a primordial soup. New findings from CERN have provided compelling evidence supporting this characterization, enhancing our understanding of the early cosmic state.
While the Big Bang theory has long been established, grasping the intricate details of the early Universe has proven challenging. Theoretical calculations and the ratio of hydrogen to helium offer some insights, but they fall short of capturing the full picture. To explore this primordial state, researchers have turned to particle physics experiments, as no material on Earth can replicate the extreme conditions of the early Universe.
Particle Collisions at CERN
At CERN, scientists have been conducting experiments by colliding heavy ions at nearly the speed of light. These collisions create a fleeting state of quarks and gluons, reminiscent of the primordial soup. However, this state exists for only a minuscule fraction of a second, making direct observation impossible. Instead, researchers analyze the cascade of particles produced by this plasma state, akin to studying water waves by observing how they interact with the shore.
Investigating Z-Bosons
In a recent study, the team focused on the interactions of Z-bosons, which serve as carriers of weak interactions, similar to how photons operate in electromagnetism. By comparing the observed results with various models of quark-gluon plasma (QGP), they determined that the most accurate model depicts the plasma as having a soupy consistency.
Evidence of Wakes in the Plasma
The researchers discovered evidence of wakes within the plasma field, akin to ripples created when a hand moves through water. This finding indicates that particles traversing the quark-gluon plasma behave similarly to objects moving through a liquid, confirming its fluid-like properties. Understanding that the early Universe was a thick soup will significantly enhance our comprehension of its initial moments.
Such insights are crucial, as the behavior of shock waves differs in fluids compared to gases or solids, influencing the formation of the first atoms and the emergence of galaxies and black holes. Future studies aim to refine the understanding of these wakes, including their speed and size, which will provide further details on the plasma’s density and viscosity. In essence, researchers are working to quantify just how soupy the primordial soup truly was.
Reference: CMS Collaboration. “Evidence of medium response to hard probes using correlations of Z bosons with hadrons in heavy ion collisions.” Physics Letters B (2025): 140120.
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