Secluded Dark Sector and Muon $(g-2)$ in the Light of Fast Expanding Universe

Sougata Ganguly, Sourov Roy, Ananya Tapadar

The lack of information before Big Bang Neucleosynthesis (BBN) allow us to assume the presence of a new species $\varphi$ whose energy density redshifts as $a^{-(4+n)}$ where $n>0$ and $…