School of Particles and Accelerators
Wednesday Weekly Seminar – Hybrid Format

Date:

Wednesday, Jan 8, 2025 / چهارشنبه، 19 دی 1403

Time:

11:00 AM - 12:00 PM (Tehran time)

Speaker:

Dr. Saeed Abbaslu


Affiliation:

School of Physics, IPM

Title:

A novel global charge conservation in the symmetric phase of the early universe


Title in Persian:

بار پایسته سراسری در فاز متقارن جهان اولیه


Abstract:

In the Standard Model at high temperatures, anomalous effects contribute to the violation of baryon number (B) and lepton number (L), separately, while B−L remains conserved. There are also corresponding changes in the helicity of the hypermagnetic field (h) and the Chern-Simons numbers of the non-Abelian gauge fields (NCS,W and NCS,S). In this study, we investigate a baryogenesis process in the symmetric phase of the early Universe by taking into account the Abelian and non-Abelian anomalous effects as well as the perturbative chirality-flip processes of all fermions. We calculate explicitly the time evolution of all relevant physical quantities, including those of h and NCS,W, and show that there is another conserved global charge involving total matter-antimatter asymmetry B+L, hypermagnetic helicity hB and NCS,W.

Indico Link: https://indico.hep.ipm.ir/e/s.abbaslou

Meeting Place: Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually: https://www.skyroom.online/ch/ipm-particles/weekly-seminar