非微扰模量衰变与多组分暗物质
Non-Perturbative Modulus Decay and Multi-Component Dark Matter
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中文总结 AI 辅助
本文研究模量凝聚体的非微扰衰变，发现Wino产生被抑制而轴子通道可能显著影响暗物质组分与暗辐射，需非线性研究验证。
中文摘要 AI 辅助
非热宇宙学历史依赖于以下假设：在暴胀期间被位移的标量场经历相干振荡，在大爆炸核合成之前主导宇宙的能量密度，并通过引力抑制的相互作用进行微扰衰变。此外，通常假设只有一个暗物质组分。这个早期物质主导时期是非热WIMP产生、轴子暗物质、熵产生和暗辐射的通常预测的基础。本文考察了这一图景在模量凝聚体的非微扰衰变下是否具有动力学稳健性。在本工作中，我们使用适用于$G_2$紧化的有效场论来研究振荡模量的非微扰粒子产生。我们发现，在相关参数区域内，类Wino费米子的非微扰产生被强烈抑制。相反，模量依赖的轴子动能项允许窄的不稳定带，其增长率可以超过哈勃率。然而，仅靠线性Floquet分析无法确定这些带是否显著消耗模量凝聚体，因为宇宙膨胀、反作用、再散射以及有效理论中的高阶算符可能变得重要。因此，常规的模量主导宇宙学对Wino和规范场预加热保持稳健，而轴子通道提供了一个可能重要的修正，需要非线性研究。如果足够高效，轴子产生可以改变Wino和轴子之间的暗物质分配，并增强暗辐射丰度。
英文摘要
Non-thermal cosmological histories rest on the assumption that scalars displaced during inflation undergo coherent oscillations, dominate the energy density of the universe before Big Bang Nucleosynthesis, and decay perturbatively through gravitationally suppressed interactions. In addition, usually a single dark matter component is assumed. This early matter-dominated era is the basis for the usual predictions of non-thermal WIMP production, axion dark matter, entropy generation, and dark radiation. This paper examines whether this picture is dynamically robust against non-perturbative decay of the modulus condensate. In this work, we study non-perturbative particle production from oscillating moduli using the effective field theory appropriate to $G_2$ compactifications. We find that non-perturbative production of Wino-like fermions is strongly suppressed in the relevant parameter regime. In contrast, a modulus-dependent axion kinetic term admits narrow instability bands with growth rates that can exceed the Hubble rate. A linear Floquet analysis alone, however, cannot determine whether these bands significantly deplete the modulus condensate, since cosmic expansion, backreaction, rescattering, and higher-order operators in the effective theory can become important. As a result, the conventional modulus-dominated cosmology remains robust against Wino and gauge-field preheating, while the axion channel provides a potentially important modification that requires nonlinear study. If sufficiently efficient, axion production can alter the division of dark matter between Winos and axions and enhance the dark-radiation abundance.
发表机构
- University of Michigan（密歇根大学）
- Massachusetts Institute of Technology（麻省理工学院）
- Syracuse University（雪城大学）
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