Tiny "Big Bang" Created With Small Atomic Nuclei

Introduction To The Primordial State Of Matter

Physicists at the University of Copenhagen have successfully recreated the primordial state of matter believed to have filled the Universe shortly after the Big Bang. This state of matter, known as quark-gluon plasma, is thought to have existed in the Universe during its first millionth of a second. The researchers achieved this by colliding atomic nuclei far smaller than previously thought possible, using oxygen-16 and neon-20 nuclei. This breakthrough could help scientists understand the first moments of cosmic history and some of the deepest questions in nuclear physics.

The Experiment And Its Findings

The experiment was conducted at CERN in Switzerland, where atomic nuclei can be accelerated to nearly the speed of light and smashed together. The collisions create tiny droplets of quark-gluon plasma, which survive for only a tiny fraction of a second before expanding and converting into other particles. Scientists cannot observe the plasma itself directly, but instead measure the particles that emerge immediately afterward and study how those particles move. The new results show that these movement patterns preserve information about the original shape of the colliding nuclei. For example, collisions between two oxygen nuclei generate a relatively rounded pattern, while collisions involving neon create a distinctive bowling-pin-shaped pattern.

Understanding The Shapes And Internal Structures Of Atomic Nuclei

Physicists have been trying to understand the shapes and internal structures of atomic nuclei for more than 70 years. The question has particular relevance to the strong force, one of the four fundamental forces of nature. By studying the particles that emerge from the collisions, scientists can gain insights into atomic nuclei that are otherwise difficult to obtain. As Postdoctoral Researcher Emil Gorm Dahlbæk Nielsen explains, "It is a bit like shining light on an object and seeing its shadow. You cannot see the object directly, but its shadow reveals its shape. In the same way, the movement of the particles reveals the geometric shape of the atomic nuclei that was present at the beginning of the collision."

Implications And Future Outlook

The discovery that quark-gluon plasma can be created using lighter elements has significant implications for our understanding of the early Universe. While it does not mean that oxygen or neon nuclei were present shortly after the Big Bang, it does bring scientists one step closer to discovering the actual culprits. The next phase of research will involve smashing atomic nuclei using even lighter candidates, such as helium-4. As Associate Professor You Zhou notes, "These two things turn out to be much more closely connected than one might initially think." The connection between the structure of atomic nuclei and the primordial state of matter is a compelling one, and further research is likely to shed more light on the mysteries of the early Universe.

Conclusion And Future Directions

The creation of a tiny "Big Bang" using surprisingly small atomic nuclei is a major breakthrough in quantum physics. The findings of the research team at the University of Copenhagen and CERN have opened up new avenues for understanding the primordial state of matter and the shapes and internal structures of atomic nuclei. As scientists continue to explore the properties of quark-gluon plasma and the strong force, they may uncover even more secrets about the early Universe and the fundamental nature of matter itself.

Sources

This is an original synthesis by Qivorane based on reporting from the outlets below.