手性暗光子的共振引力产生
Resonant Gravitational Production of Chiral Dark Photons
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中文总结 AI 辅助
本研究探讨暴胀期间手性暗光子通过快子不稳定性和参数共振的引力产生，拓宽暗物质参数空间，并揭示再加热历史编码于数密度谱中。
中文摘要 AI 辅助
具有手性、奇偶性破缺耦合到赝标量场的矢量场已知会发生共振放大。在本工作中，我们研究了早期宇宙暴胀期间宇宙学引力粒子产生背景下的这一现象。我们考虑一个与暴胀子具有奇偶性破缺耦合的有质量矢量（暗光子）场。存在两种产生机制，由耦合强度与暗光子质量的相对大小划分，分别源于快子不稳定性和参数共振。由于该耦合，横向模式（在最小耦合和非最小耦合理论中均处于次主导地位）可以主导晚期总丰度。因此，暗光子暗物质的可行参数空间得以拓宽。此外，在快子情形下，产生由单一螺旋度模式主导，导致手性暗光子群体可能产生潜在的宇称破缺观测信号。我们进一步探讨了产生对再加热历史的依赖性，并发现关于再加热的信息编码在数密度谱中。
英文摘要
Vector fields with a chiral, parity-odd coupling to a pseudoscalar field are known to undergo resonant amplification. In this work, we study this phenomenon in the context of cosmological gravitational particle production during early-universe inflation. We consider a massive vector (dark photon) field with a parity-odd coupling to the inflaton. There are two regimes of production, delineated by the relative size of the coupling and the dark photon mass, arising from a tachyonic instability, and a parametric resonance, respectively. As a result of the coupling, the transverse modes, subdominant in both the minimally and nonminimally coupled theories, can dominate the total late-time abundance. The viable parameter space for dark-photon dark matter is thus widened. Furthermore, in the tachyonic case, the production is dominated by a single helicity mode, leading to a population of chiral dark photons that can lead to potential parity-violating observational signatures. We further explore the dependence of the production on the reheating history, and find that information about reheating is encoded in the number density spectrum.
发表机构
- Johns Hopkins University（约翰斯·霍普金斯大学）
- The University of Chicago（芝加哥大学）
机构由 AI 辅助整理，请以论文原文为准。
