http://arxiv.org/abs/1903.00701
The small-scale crisis, discrepancies among observations, theoretical predictions and N-body simulations on the sub-galactic scale structures, may imply a suppression of matter perturbation on small scale. In this work, we find that a novel gravitational effect originated from the non-equilibrium process of dark matter production can result in such a suppression, which may be relevant for the small-scale problems. As an illustration, we show that if the particle mass of dark matter is $m_\chi=2.2~\text{MeV}$, the suppression takes place at $1~\text{kpc}$. This new mechanism of suppression is alternative to the well-known mechanisms employing broken-scale-invariance of inflation or warm/exotic-interacting dark matter — as the suppression predicted by this new mechanism takes place at an unique epoch that from the ending of inflation to the moment of the perturbations re-entering horizon.
C. Li
Tue, 5 Mar 19
33/73
Comments: 5 pages, 5 figures
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