• Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars

September 1, 2026 2:00 PM
PAIS 3205

Host:

Huaiyu Duan

Presenter:

Rouzbeh Allahverdi

The standard procedure to do computations in Quantum Field Theory (QFT) uses divergent multi-loop Feynman diagrams, their regularization to handle the ultra-violet (UV) divergences, and then renormalization to remove them. At the same time, the ultimate outcome of the renormalization is the mapping of several finite parameters defining the renormalizable field theory into different observables (e.g. all kinds of particle cross-sections). A natural question is how to relate the parameters of the theory to observables without running into intermediate UV divergences.

In this talk, I will use the φ⁴ theory as a vehicle to demonstrate the textbook treatment of regularization and renormalization.

Refences:

1. [hep-th/0405032] Renormalization without infinities
2. [2110.05175] QFT without infinities and hierarchy problem