Kavli Affiliate: Shigeki Matsumoto
| First 5 Authors: Yu Watanabe, Shigeki Matsumoto, Christopher M. Karwin, Tom Melia, Michela Negro
| Summary:
Light weakly interacting massive particles (WIMPs), whose masses are in the
sub-GeV scale, have been attracting more attention due to the negative results
searching for traditional WIMPs. The light WIMPs are expected to produce gamma
rays from annihilation in the MeV energy region. Advancements in technology
have opened up possibilities to precisely detect MeV gamma rays, leading to the
upcoming space-based mission of the Compton Spectrometer and Imager (COSI). We
comprehensively and quantitatively study the phenomenology of light WIMPs to
determine if the COSI observations will probe their viable model parameter
regions. We first construct models to describe light WIMPs based on the
minimality and renormalizability of quantum field theory. Next, we impose
various constraints on the models obtained from cosmological observations (CMB,
BBN) and dark matter searches (accelerator, underground, astrophysical
experiments, etc.). Finally, we identify viable parameter regions in each model
and discuss whether or not COSI will be sensitive to the parameter regions. We
find that a velocity-dependent annihilation cross-section is predicted in some
regions, enabling COSI to detect the dark matter signal while avoiding severe
constraints from cosmological observations.
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