Scientists discovered a new series for pi through string theory research, echoing a 15th-century formula by Madhava. By combining Euler-Beta Functions and Feynman Diagrams, they modeled particle interactions efficiently. Credit: SciTechDaily.com
Researchers found a new series representation for pi while exploring string theory and particle interactions.
Their formula is similar to one by Madhava in the 15th century. Combining the Euler-Beta Function and Feynman Diagram, they created an efficient model, revealing this new pi representation. Theoretical work like this can eventually lead to practical applications.
While investigating how string theory can be used to explain certain physical phenomena, scientists at the Indian Institute of Science (IISc) have stumbled upon a new series representation for the irrational number pi. It provides an easier way to extract pi from calculations involved in deciphering processes like the quantum scattering of high-energy particles.
The new formula under a certain limit closely reaches the representation of pi suggested by Indian mathematician Sangamagrama Madhava in the 15th century, which was the first ever series for pi recorded in history. The study was carried out by Arnab Saha, a post-doc and Aninda Sinha, Professor at the Centre for High Energy Physics (CHEP), and published in Physical Review Letters.
Aninda Sinha (left) and Arnab Saha (right). Credit: Manu Y
Our efforts, initially, were never to find a way to look at pi. All we were doing was studying high-energy physics in quantum theory and trying to develop a model with fewer and more accurate parameters to understand how particles interact. We were excited when we got a new way to look at pi, Sinha says.
Sinhas group is interested in string theory the theoretical framework that presumes that all quantum processes in nature simply use different modes of vibrations plucked on a string. Their work focuses on how high energy particles interact with each other such as protons smashing together in the Large Hadron Collider and in what ways we can look at them using as few and as simple factors as possible. This way of representing complex interactions belongs to the category of optimization problems. Modeling such processes is not easy because there are several parameters that need to be taken into account for each moving particle its mass, its vibrations, the degrees of freedom available for its movement, and so on.
Saha, who has been working on the optimization problem, was looking for ways to efficiently represent these particle interactions. To develop an efficient model, he and Sinha decided to club two mathematical tools: the Euler-Beta Function and the Feynman Diagram. Euler-Beta functions are mathematical functions used to solve problems in diverse areas of physics and engineering, including machine learning. The Feynman Diagram is a mathematical representation that explains the energy exchange that happens while two particles interact and scatter.
What the team found was not only an efficient model that could explain particle interaction, but also a series representation of pi.
In mathematics, a series is used to represent a parameter such as pi in its component form. If pi is the dish then the series is the recipe. Pi can be represented as a combination of many numbers of parameters (or ingredients). Finding the correct number and combination of these parameters to reach close to the exact value of pi rapidly has been a challenge. The series that Sinha and Saha have stumbled upon combines specific parameters in such a way that scientists can rapidly arrive at the value of pi, which can then be incorporated into calculations, like those involved in deciphering the scattering of high-energy particles.
Physicists (and mathematicians) have missed this so far since they did not have the right tools, which were only found through work we have been doing with collaborators over the last three years or so, Sinha explains. In the early 1970s, scientists briefly examined this line of research but quickly abandoned it since it was too complicated.
Although the findings are theoretical at this stage, it is not impossible that they may lead to practical applications in the future. Sinha points to how Paul Dirac worked on the mathematics of the motion and existence of electrons in 1928, but never thought that his findings would later provide clues to the discovery of the positron, and then to the design of Positron Emission Tomography (PET) used to scan the body for diseases and abnormalities. Doing this kind of work, although it may not see an immediate application in daily life, gives the pure pleasure of doing theory for the sake of doing it, Sinha adds.
Reference: Field Theory Expansions of String Theory Amplitudes by Arnab Priya Saha and Aninda Sinha, 28 May 2024, Physical Review Letters. DOI: 10.1103/PhysRevLett.132.221601
Link:
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