A new way to test the WIMP dark matter models

Abstract

In this paper, we investigate the possibility of testing the weakly interacting massive particle (WIMP) dark matter (DM) models by applying the simplest phenomenological model which introduces an interaction term between dark energy (DE) and WIMP DM, i.e., $Q=3{\gamma }_{DM}H{\rho }_{DM}$. In general, the coupling strength ${\gamma }_{DE}$ is close to $0$ as the interaction between DE and WIMP DM is very weak, thus the effect of ${\gamma }_{DE}$ on the evolution of $Y$ associated with DM energy density can be safely neglected. Meanwhile, our numerical calculation also indicates that $x_f\approx 20$ is associated with DM freeze-out temperature, which is the same as the vanishing interaction scenario. As for DM relic density, it will be magnified by $\frac{2-3{\gamma }_{DM}}{2}[2\pi g_{\ast }{m}_{DM}^3/(45s_0{x}_f^3){]}^{{\gamma }_{DM}}$ times, which provides a new way to test WIMP DM models. As an example, we analyze the case in which WIMP DM is a scalar DM. (SGL+SNe+Hz) and (CMB+BAO+SNe) cosmological observations will give ${\gamma }_{DM}=0.134_{-0.069}^{+0.17}$ and ${\gamma }_{DM}=-0.0008\pm 0.0016$, respectively. After further considering the constraints from DM direct detection experiment, DM indirect detection experiment, and DM relic density, we find that the allowed parameter space of the scalar DM model will be completely excluded for the former cosmological observations, while it will increase for the latter ones. Those two cosmological observations lead to an almost paradoxical conclusion. Therefore, one could expect more stringent constraints on the WMIP DM models, with the accumulation of more accurate cosmological observations in the near future.

arXiv comment23 pages, 7 figures

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