Date: October 09, 2026 Time: 11:00 AM Location: Conference Room (9-117), Department of Physics, SBASSE, LUMS
Speaker: Prof Asghar Qadir
Observations of the motion of stars in galaxies suggested that there should be more matter than we saw if the law of gravity was correct. However, seeing a discrepancy in the theory does not prove that there is something more. All it shows is that either there is something more, or the theory is wrong. Even when the discrepancies started to mount, indicating that the galaxies stretched beyond what we saw, we needed to actually see the matter. We have not only been able to see it, we have been able to see its dynamics. This is the story of looking for and seeing "ghosts", and actually measuring and weighing them. We now even know what they are made of. However, like all good mystery stories, it leaves more to be yet uncovered --- to be told in the sequel when it is written.
Date: October 09, 2026 Time: 02:00 PM Location: Conference Room (9-117), Department of Physics, SBASSE, LUMS
Supervisor: Dr. Tajdar Mufti Student(s): Waqar Akmal (2026-10-0417) BS Physics Student at LUMS
Perturbation theory in quantum field theory (QFT) provides a theoretical gold-standard framework for solving interacting field theory models. However, its usefulness is limited to weaker-coupling regimes, as the power (Dyson) series diverges at higher coupling. To investigate such models, we need a tool that goes beyond series expansion and provides us with a vantage point to explore the non-perturbative aspects of these theories. Dyson-Schwinger Equations (DSEs) are one framework that addresses this problem through an infinite system of coupled integral equations that must be solved self-consistently, allowing us to extract physical parameters directly at strong couplings.
This thesis represents a study of the Yukawa vertex constructed from the computed vertex obtained through DSE computations. The DSE computations were carried out using machine-learning-constructed field propagators and were compared against the results from lattice simulations. This study concludes that the conjunction of lattice simulations, DSEs, and machine learning can form a coherent picture of the scalar sector under the Yukawa interaction
09
Oct
Date: October 09, 2026
Time: 11:00 AM
Location: Conference Room (9-117), Department of Physics, SBASSE, LUMS
Speaker: Prof Asghar Qadir
09
Oct
Date: October 09, 2026
Time: 02:00 PM
Location: Conference Room (9-117), Department of Physics, SBASSE, LUMS
Supervisor: Dr. Tajdar Mufti
Student(s): Waqar Akmal (2026-10-0417) BS Physics Student at LUMS