Imagine this: a physicist from the University of Cincinnati has just accomplished what two of the most beloved fictional scientists in television history could not. In an exciting breakthrough, Professor Jure Zupan and his research team have theorized a method for producing elusive subatomic particles known as axions within fusion reactors—something that Sheldon Cooper and Leonard Hofstadter from CBS's iconic sitcom "The Big Bang Theory" grappled with but ultimately failed to solve.
In their entertaining yet intellectually stimulating series, which aired from 2007 to 2019 and won seven Emmy Awards, these characters tackled complex physics problems across several episodes, including the enigma of axions. However, it is Professor Zupan and collaborators from Fermi National Laboratory, MIT, and Technion–Israel Institute of Technology who have made significant strides in this field, as outlined in their recent study published in the Journal of High Energy Physics (you can check it out here).
So, what exactly are axions? These hypothetical particles are crucial for unraveling the mysteries of dark matter, an elusive substance that makes up a substantial portion of the universe’s mass yet remains invisible to direct observation. Dark matter is termed 'dark' because, unlike ordinary matter, it neither absorbs nor reflects light. Despite its hidden nature, physicists infer its presence through its gravitational influence, which affects the motion of galaxies and the stars within them. The leading theoretical candidate for dark matter is indeed the axion, theorized to be extraordinarily light.
In their paper, Zupan and his colleagues examined a specific type of fusion reactor that utilizes deuterium and tritium, housed within a lithium-lined chamber, currently under development in southern France as part of an international initiative. This innovative reactor holds promise not only for energy production but also for generating dark sector particles, thanks to the substantial flow of neutrons produced during the fusion process.
Zupan explains, "Neutrons interact with the materials that line the reactor, leading to nuclear reactions capable of creating new particles." Another pathway to produce these new particles occurs when neutrons collide with other particles, slowing down and releasing energy in a phenomenon known as bremsstrahlung or "braking radiation." This process could potentially yield axions or axion-like particles.
Interestingly, while the concept was introduced in the show, Sheldon and Leonard fell short of making it work, highlighting a gap between fiction and scientific reality. Zupan notes, "The general idea from our paper was discussed in ‘The Big Bang Theory’ years ago, but Sheldon and Leonard couldn’t make it work."
Fans of the show may recall an episode where a whiteboard bears a complex equation that Zupan claims illustrates how axions could be generated by solar processes. In a subsequent scene, another equation appears alongside a distinctly drawn sad face—an artistic touch that signifies the disheartening results of their calculations regarding axion detection from the fusion reactor compared to that of the sun. Zupan elaborates, "The sun is a massive source of energy, and the likelihood of axions being produced there and reaching Earth is much higher than in fusion reactors utilizing similar processes. However, alternative processes in reactors might still yield these particles."
It's worth noting that the characters never explicitly mention axions or the equations on-screen; they serve as delightful Easter eggs for physicists, blending scientific theory with humor in a show celebrated for integrating real scientific concepts like Schrödinger’s cat and the Doppler effect into its narratives, often featuring cameos from Nobel laureates and "Star Trek" cast members.
Zupan reflects on this unique aspect of the show, saying, "That’s why it’s fantastic to watch as a scientist. There are many layers to the jokes."
So, what’s next for scientific discovery at UC? As a Carnegie 1 research institution, the University of Cincinnati continues to lead groundbreaking research that spans various fields, from cutting-edge medical studies to transformative engineering innovations and social advancements.
Curious about more pioneering research at UC? You can explore the exciting developments here.
What are your thoughts on the intersection of science and popular culture? Do you think such portrayals help foster a greater interest in physics? Or do they often oversimplify complex theories? Share your opinions in the comments below!
