体粘滞非标准宇宙学中的WIMP暗物质
WIMP dark matter in bulk viscous non-standard cosmologies
AI总结：
本研究将含体粘滞场$\phi$的新型非标准宇宙学用于WIMP暗物质参数空间研究，发现了不同于经典图景的新搜寻区域，特定参数下可复现现有暗物质遗迹密度。
摘要：
本文探究了经典非标准宇宙学图景的一种拓展形式：在早期宇宙中与辐射组分相互作用的新场$\phi$会以体粘滞的形式发生耗散过程。我们假设相互作用项为$\Gamma_\phi\rho_\phi$（其中$\Gamma_\phi$为该场的衰变率，$\rho_\phi$为其能量密度），并在Eckart理论框架下采用形式为$\xi=\xi_{0}\rho_\phi^{1/2}$的体粘滞系数，将这一新型非标准宇宙学用于研究WIMP（弱相互作用大质量粒子）暗物质候选体产生的参数空间。该参数空间与经典非标准宇宙学图景存在偏差，得到了可供搜寻该候选体的新区域。特别是对于自由参数的特定组合，我们发现存在大范围的参数区域，可让该模型确立暗物质的存在并复现当前可观测的遗迹密度。
英文摘要：
In this paper, we explored an extension of the classical non-standard cosmological scenario in which the new field, $ϕ$, which interacts with the radiation component in the early universe, experiences dissipative processes in the form of a bulk viscosity. Assuming an interaction term given by $Γ_ϕρ_ϕ$, where $Γ_ϕ$ accounts for the decay rate of the field and $ρ_ϕ$ corresponds to its energy density, and a bulk viscosity according to the expression $ξ=ξ_{0}ρ_ϕ^{1/2}$ in the framework of Eckart's theory, we apply this novel non-standard cosmology to study the parameters space for WIMPs Dark Matter candidate production. This parameter space shows deviations from the classical non-standard cosmological scenario, obtaining new regions to search for this candidate. In particular, for certain combinations of the free parameters, we found large regions in which the model can establish the DM and reproduce the current observable relic density.
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