X-ray lines and self-interacting dark matter.

Area of Science:

• Particle Physics
• Cosmology
• Astrophysics

Background:

• Dark matter's nature remains elusive, with ongoing research into its properties and interactions.
• Self-interacting dark matter (SIDM) models offer explanations for observed dark matter distributions in galactic clusters.
• Monochromatic signals, particularly X-ray lines, provide potential probes of dark matter annihilation or decay.

Purpose of the Study:

• To investigate the correlation between monochromatic signals from dark matter annihilation and its self-interacting cross section.
• To explore a complex scalar dark sector model where a pseudo-scalar acts as a warm dark matter candidate.
• To reconcile observational data from galaxy clusters and X-ray constraints with theoretical dark matter models.

Main Methods:

• Applying a complex scalar dark sector model to analyze dark matter self-interaction and annihilation.
• Utilizing recent observations of galaxy cluster Abell 3827 for self-interacting dark matter constraints.
• Combining constraints from monochromatic X-ray line annihilation cross sections with experimental analyses.

Main Results:

• The proposed model naturally produces a monochromatic keV signal, consistent with observations of Perseus and Andromeda.
• The model predicts a self-interacting cross section of approximately [Formula: see text], aligning with Abell 3827 observations.
• The study establishes a connection between dark matter self-interaction and observable monochromatic signals.

Conclusions:

• The complex scalar dark sector model provides a viable framework for explaining both self-interacting dark matter and monochromatic signals.
• Future direct detection experiments can potentially distinguish this model from other dark matter candidates.
• The findings highlight the importance of multi-messenger approaches in dark matter research.