来自 AutoTherm 的热引力微子和轴微子产生率
Thermal gravitino and axino rate from AutoTherm
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中文总结 AI 辅助
本文使用新工具 AutoTherm 从第一性原理热场论重新计算热引力微子和轴微子产生率，提出调谐方案解决严格领头阶在软动量下的负率问题，并给出新的可靠拟合，揭示重求和方案选择带来约 1.5-3 倍的理论不确定性。
中文摘要 AI 辅助
如果超相对论性超对称粒子在早期宇宙中被热产生，它们将影响大爆炸核合成、暗物质和再加热约束。虽然热引力微子和轴微子产生的基本框架已经很好地建立，但计算尚未完全解决。在这项工作中，我们使用 AutoTherm 重新审视这个问题，AutoTherm 是一种新工具，它从第一性原理热场论自动化计算热产生率，并控制硬热圈重求和方案中固有的理论不确定性。我们证明，严格的领头阶（LO）方案虽然对硬动量是无歧义的，但当外推到软动量时可能产生非物理的负产生率。为了解决这个问题，我们引入了一个调谐方案，该方案确保正性并在高动量下与严格领头阶一致，同时避免规范依赖的病态。我们将我们的结果与文献中现有的参数化进行比较，识别出差异，并为引力微子和轴微子产生率的规范贡献和汤川贡献提供新的可靠拟合。重求和方案的选择给出了一个因子约为 1.5...3 的理论不确定性，具体取决于温度，这一点至今未被充分重视。这种残余的散布应在引力微子/轴微子丰度的精密宇宙学分析中加以考虑。
英文摘要
If ultrarelativistic supersymmetric particles are thermally produced in the early universe they would influence big-bang nucleosynthesis, dark matter and reheating constraints. While the basic framework for thermal gravitino and axino production is well established, the calculation is not completely settled. In this work, we revisit the problem using AutoTherm, a new tool which automates the computation of thermal rates from first-principles Thermal Field Theory, with control over the inherent theory uncertainty in Hard Thermal Loop resummation schemes. We demonstrate that the strict leading-order (LO) scheme, while unambiguous for hard momenta, can yield unphysical negative rates when extrapolated to soft momenta. To address this, we introduce a tuned scheme that ensures positivity and agreement with strict LO at high momenta, while avoiding gauge-dependent pathologies. We compare our results with existing parametrizations in the literature, identifying discrepancies and providing new, reliable fits for the gauge and Yukawa contributions to the gravitino and axino production rates. The choice of resummation scheme gives a theory uncertainty by a factor of $\sim 1.5$...$3$ depending on the temperature, which has been underappreciated until now. This residual spread should be taken into account in precision cosmological analyses of gravitino/axino abundancies.
发表机构
- SUBATECH, Nantes Université, IMT Atlantique, IN2P3/CNRS（SUBATECH，南特大学，IMT大西洋学院，IN2P3/CNRS）
机构由 AI 辅助整理，请以论文原文为准。
