Name: Nabanita Das
Affiliation: Presidency University
Conference ID : ASI2022_53
Title : Cosmological Cosmic Rays as a Solution For The Primordial Lithium Problem
Authors : Nabanita Das (Presidency University, Kolkata, India) and Saumyadip Samui (Presidency University, Kolkata, India).
Abstract Type: Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : The cosmological lithium problem is one of the unsolved mysteries in the history of universe. Observations have revealed that the existing abundance of Li6 in the metal poor halo stars is 1000 times higher than the primordial Big Bang Nucleosynthesis (BBN) abundance, which is of the order of 10^{-14}. In this work, we propose a possible production of Li6 by considering the interaction of cosmic rays (CRs) with the intergalactic medium (IGM). The cosmic rays are likely to be generated from supernova explosions of the earliest (Population-III) stars and escape the corresponding halo. We consider that the α-particles in the cosmic rays interact with the He in the IGM and produce Li6. We show that cosmic rays generated by all Pop~III galaxies can produce enough amount of lithium by redshift, z=3 that can match with the observation of halo stars.