33 research outputs found
Addressing the self-interaction for ELDER dark matter from the 21-cm signal
The self-interacting dark matter can affect various cosmological processes.
Such interactions can be number conserving (\emph{e.g.} ) or
number violating (\emph{e.g.} etc.). The
latter processes where three (or more) dark matter particles undergo
self-annihilation/scattering to produce less number of dark matter is termed as
``Cannibalism'' process. In this work, the self-interaction of dark matter and
the strength of such interactions are investigated in the light of experimental
results of the global 21-cm spectrum of neural hydrogen from the era of cosmic
dawn. From the present work, it appears that process is much
more dominant over the process. It is also found that such
interactions affect the dark matter-baryon elastic scattering cross-section.
The study also indicates the presence of multi component dark matter of
different mass range in the Universe.Comment: 19 pages, 5 figure