arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.11548astro-ph.COhep-phhep-th
收藏

WIMP暗物质模型检验的一种新方法

A new way to test the WIMP dark matter models

Wei Cheng, Yuan He, Jin-Wang Diao, Yu Pan, Jun Zeng, Jia-Wei Zhang

摘要:

在本文中,我们研究了用最简单的唯象模型检验弱相互作用大质量粒子(WIMP)暗物质(DM)模型的可能性,该唯象模型在暗能量(DE)和WIMP DM之间引入了一个相互作用项,$Q = 3γ_{DM} Hρ_{DM}$。一般情况下,由于DE和WIMP DM之间的相互作用很弱,耦合强度$γ_{DE}$接近于$0$,因此$γ_ {DE}$对与DM能量密度相关的$Y$演化的影响可以忽略不计.同时,我们的数值计算还表明,$x_f\approx20$与DM冻结温度有关,这与消失相互作用情况相同。对于DM遗迹密度,将被放大$\frac{2-3γ_{DM}}{2}[{2πg_* m_{DM}^3}/{(45 s_0 x_f^3})]^{γ_{DM}}$倍,这为检验WIMP DM模型提供了新的途径。作为一个例子,我们分析的情况下,WIMP DM是一个标量DM。(SGL+SNe+Hz)和(CMB+BAO+SNe)的宇宙学观测将分别给出$γ_{DM}=0.134^{+0.17}_{-0.069}$和$γ_{DM}=-0.0008\pm0.0016$。在进一步考虑DM直接探测实验、DM间接探测实验和DM遗迹密度的约束后,我们发现对于前者,标量DM模型的允许参数空间将被完全排除,而对于后者,允许参数空间将增大。这两个宇宙学观测导致了一个几乎自相矛盾的结论。因此,随着在不久的将来更精确的宇宙学观测的积累,人们可以期待对WMIP DM模型的更严格的限制。

英文摘要:

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., $Q = 3γ_{DM} Hρ_{DM}$. In general, the coupling strength $γ_{DE}$ is close to $0$ as the interaction between DE and WIMP DM is very weak, thus the effect of $γ_ {DE}$ on the evolution of $Y$ associated with DM energy density can be safely neglected. Meanwhile, our numerical calculation also indicates that $x_f\approx20$ 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 $\frac{2-3γ_{DM}}{2}[{2πg_* m_{DM}^3}/{(45 s_0 x_f^3})]^{γ_{DM}}$ 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 $γ_{DM}=0.134^{+0.17}_{-0.069}$ and $γ_{DM}=-0.0008\pm0.0016$, 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑