论文标题
弹跳宇宙中温暖和冷的暗物质
Warm and Cold Dark Matter in Bouncing Universe
论文作者
论文摘要
弹跳的宇宙学不受最初的奇异性，是通货膨胀的有前途的替代方案。但是，弹跳后阶段的熵产生仍不清楚。在这项工作中，我们使用新揭开的DM候选者（EQFIDM），该候选者可以在弹跳后不久直接在热平衡中冻结，以追踪残留弹跳场（RBF）的熵产生的衰变过程。具体而言，我们提出了独立的形式主义，以在通用弹跳宇宙中获得RBF的熵产生衰减的所有九种可能的类型，并表明，由于不同类型的熵作品，该新候选者的粒子质量可以从Sub-Kev量表到超级TEV量表到超级TEV量表。随着目前的Lyman-$α$森林观察在线性物质谱系上观察，我们发现，尽管排除了四种类型，但其余五种类型表明，具有有效的熵生产的温暖和冷eqfidm候选者，可以使用当前的观察结果。然后，我们说明了如何通过当前观察结果来限制RBF的性质，并研究EQFIDM对减轻小规模危机的潜力。
Being free from the initial singularity, bouncing cosmology serves as a promising alternative to inflation. However, the entropy production during the post-bounce phase is still unclear. In this work, we use a newly unveiled DM candidate (EQFIDM), which can directly freeze in thermal equilibrium shortly after bounce, to trace the entropy-producing decay process of residual bouncing field (RBF). Specifically, we present a model-independent formalism to obtain all nine possible types of the entropy-producing decay of RBF within a generic bouncing universe, and show that, due to the entropy productions in different types, the particle mass of this new candidate can range from sub-keV scale to super-TeV scale. With current Lyman-$α$ forest observation on linear matter spectrum, we find that, although four types have been excluded, the rest five types, which suggest warm and cold EQFIDM candidates with effective entropy productions, are accommodated with current observation. Then we illustrate how the nature of RBF can be constrained by current observation and investigate the potential of EQFIDM on alleviating small-scale crisis.
