3 years ago

Dark matter kinetic decoupling with a light particle

Ayuki Kamada, Tomo Takahashi
We argue that the acoustic damping of the matter power spectrum is not a generic feature of the kinetic decoupling of dark matter, but even the enhancement ( overshooting ) can be realized depending on the nature of the kinetic decoupling when compared to that in the standard cold dark matter model. We consider a model that exhibits a sudden kinetic decoupling and investigate cosmological perturbations in the standard cosmological background numerically in the model. We also give an analytic discussion in a simplified setup. Our results indicate that the nature of the kinetic decoupling could have a great impact on small scale density perturbations.

Publisher URL: http://iopscience.iop.org/1475-7516/2018/01/047

DOI: 10.1088/1475-7516/2018/01/047

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