A New Era of Unveiling the Mystery of the Universe’s Most Powerful Force

News Desk, Scientist Org

The “strong force,” also known as the strong nuclear force and recognized as the most powerful force in the universe, has long been a source of deep curiosity among scientists. This force is so strong that it binds quarks together to form fundamental particles like protons and neutrons, and unites these nucleons to create an atomic nucleus. Among the universe’s four fundamental forces—gravity, electromagnetic, weak nuclear, and strong nuclear—the strong nuclear force is the most powerful, about one hundred trillion trillion trillion times stronger than gravity. Yet, its mechanism has remained the most mysterious and incomprehensible.

The strength, or “coupling constant” (αs), of the strong nuclear force is extremely complex to calculate, because its carrier particle, the gluon, interacts with itself. In contrast, the photon—the carrier particle of the electromagnetic force—does not interact with itself, which makes it relatively easy to measure. However, in the case of the strong force, this self-interaction creates added complexity.

Until recently, scientists have only been able to measure αs at limited high-energy scales, not in the lower-energy domains relevant to daily life—precisely where this force is truly strong. Scientists referred to this area as the “Terra Damnata,” or cursed land. But recent research has finally begun to unlock the doors to this mystery.

Over the past two decades, the secrets of this mysterious domain have started to be unveiled. In 2005, Alexandre Deur, a researcher at the Thomas Jefferson National Accelerator Facility in the United States, succeeded in measuring the strength of the strong force at a low-energy scale for the first time. He found that as the distance increases, the value of αs does not continue to increase, but rather becomes constant at a certain point. This finding was contrary to established theories, which held that the value of αs would become infinite as distance increased.

Deur’s unexpected discovery quickly captured the attention of other scientists. Leading physicists like Stanley Brodsky and Craig Roberts began searching for theoretical explanations for this result. Using a new computational method called “light-front holography,” Brodsky and his collaborators demonstrated that even as distance increases, αs remains fixed at a certain value. Remarkably, their method matched Deur’s experimental data perfectly, without needing to add any extra mathematical parameters or “fudge factors.”

At the same time, Craig Roberts independently confirmed this result using the fundamental equations of Quantum Chromodynamics (QCD). Roberts and his collaborators showed in their research that the distance-dependent variation of the strong nuclear force’s coupling constant (αs) ultimately stabilizes at a finite and specific value. This solution resolves a long-standing debate and proves the universality of this value directly from the equations of QCD.

This new discovery could spark a revolution in our understanding of the universe’s fundamental forces. The constant value of this force helps scientists better understand many complex phenomena, such as the mass of atoms and the protons and neutrons inside them. Researchers have found that about 99 percent of the visible mass in the universe originates from this strong nuclear force. In other words, most of the mass we experience every day comes from the energy produced by the powerful force of gluons surrounding quarks, as described by QCD.

Another major contribution of this research is that the new understanding of the strong nuclear force could open doors to novel ideas about unified cosmic theories, higher dimensions, or a multiverse. QCD is the first complete quantum field theory to predict only finite values, whereas other theories encounter problems with infinities. As a result, many longstanding mysteries of physics may be resolved through future research in this field.

In other words, scientists no longer consider the mysterious world of the strong nuclear force, “Terra Damnata,” as cursed, but rather see it as a new realm of possibility for scientific research.