Lukewarm暴胀与QCD轴子
Lukewarm inflation and the QCD axion
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中文总结 AI 辅助
本文提出一种略高于QCD标度的暖暴胀阶段，可稀释QCD轴子丰度，避免微调初始错位角，并通过右手中微子实现，产生可观测的引力波信号。
中文摘要 AI 辅助
我们表明，在温度略高于QCD标度的晚期暖暴胀阶段，可以稀释由错位机制产生的QCD轴子丰度，从而在轴子衰变常数接近GUT标度的情景中，避免了对初始错位角进行微调的需要。我们开发了该lukewarm暴胀阶段的一个具体实现，涉及质量在0.1-1 GeV范围内的右手中微子以及相关的标量扇区，表明在该阶段相干轴子振荡被阻尼。在此情景中，先前产生的大重子不对称性也可能被稀释以产生观测值，并且lukewarm暴胀之后是一个由最轻的右手中微子主导的早期物质时期，随后它衰变为标准模型态。该模型可以通过相对论性物种数量的变化以及诱导的原初曲率功率谱的小尺度增强来检验，这些增强会导致原初黑洞和标量诱导的引力波。
英文摘要
We show that a late period of warm inflation, at temperatures just above the QCD scale, can dilute the abundance of the QCD axion produced by the misalignment mechanism, thus avoiding the need to fine-tune the initial misalignment angle in scenarios with an axion decay constant close to the GUT scale. We develop a concrete realization of this lukewarm inflation stage involving right-handed neutrinos in 0.1 - 1 GeV mass range and an associated scalar sector, showing that coherent axion oscillations are damped during this period. In this scenario, a previously generated large baryon asymmetry may also be diluted to yield the observed value, and lukewarm inflation is followed by an early-matter era dominated by the lightest right-handed neutrino, before it decays into Standard Model states. This model can be tested via changes to the number of relativistic species and the induced small-scale enhancements of the primordial curvature power spectrum, leading to primordial black holes and scalar-induced gravitational waves.
发表机构
- Univ Coimbra, Faculdade de Ciências e Tecnologia da Universidade de Coimbra（科英布拉大学科学与技术学院）
- CFisUC（科英布拉大学物理研究中心）
- Jožef Stefan Institute（约瑟夫·斯特凡研究所）
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