Lyman-alpha forest studies of cosmological simulations with inelastic two-component dark matter (2cDM)

The LambdaCDM model assumes that dark matter is collisionless. This model is very successful of large scales but seems to face some problems at galactic scales. Noteworthily, one have developed a model in which dark matter may experience dark inelastic interactions. The simplest two-component dark matter model has been shown to robustly resolve the small-scale problems in N-body dark-matter-only simulations. Thus, further modeling with baryons and baryonic feedback are needed to draw accurate conclusions. It is known that baryons provide strong feedback at low redshifts, which complicates disentangling baryonic and dark matter effects. Thus, understanding of structure formation at a higher redshift would be highly beneficial. The high-redshift structure formation can be deduced from the Lyman-alpha forest observations. Here we present the Lyman-alpha spectral analysis of the cosmological simulations using the full, state-of-the-art baryonic feedback model used in IllustrisTNG simulations. Our results indicate that the novel dark matter effects suppress the power spectrum at large k. The strength and the location of the suppression depend upon the DM interaction cross-section and the mass degeneracy parameter.