Dec 11 – 15, 2023
Saha Institute of Nuclear Physics
Asia/Kolkata timezone

Effect of co-annihilation on Big Bang Nucleosynthesis

Dec 12, 2023, 12:15 PM
1h
1st Floor, Meghnad Saha Auditorium

1st Floor, Meghnad Saha Auditorium

Speaker

Deep Ghosh (IISER, Kolkata)

Description

Abstract : The light matter abundance of our universe is sensitive to the neutron-to-proton ratio in the cosmic soup during the first phase of BBN. We consider a generic exotic particle species which co-annihilates with nucleons potentially modifying the neutron-to-proton ratio, thereby affecting the BBN predictions. In particular, the thermal freeze-out of the particle species via the co-annihilation controls the neutron freeze-out dynamics. We find that when the mass of the particle is comparable with the nucleon mass, the co-annihilation strength can be greater than the weak interaction strength without altering the BBN predictions.

Presentation materials

There are no materials yet.