标题： 不稳定的遗迹粒子的核合成约束更新 显示英文标题

标题： Updated Nucleosynthesis Constraints on Unstable Relic Particles

摘要： 我们重新审视了大爆炸核合成计算成功所提供的不稳定大质量遗迹粒子丰度的上限。 我们利用宇宙微波背景数据来限制重子与光子的比率，并将一个广泛更新的截面编目纳入到对由电磁级联引发的反应网络的新计算中，这些反应创建和破坏轻元素氘、He3、He4、Li6和Li7。 我们推导出解析近似值，以补充和检验完整的数值计算。 对He4和Li6丰度的考虑排除了仅由氘所允许的参数空间中的异常区域。 我们通过将这些结果应用于大质量引力微子来说明我们的结果。 如果它们的质量约为100 GeV，其原始丰度应该低于总熵的10^{-13}。 这将意味着再加热温度的上限为几倍的10^7 GeV，这可能对某些暴胀模型构成潜在困难。 我们讨论了可能规避这个问题的方法。 显示英文摘要

摘要： We revisit the upper limits on the abundance of unstable massive relic particles provided by the success of Big-Bang Nucleosynthesis calculations. We use the cosmic microwave background data to constrain the baryon-to-photon ratio, and incorporate an extensively updated compilation of cross sections into a new calculation of the network of reactions induced by electromagnetic showers that create and destroy the light elements deuterium, he3, he4, li6 and li7. We derive analytic approximations that complement and check the full numerical calculations. Considerations of the abundances of he4 and li6 exclude exceptional regions of parameter space that would otherwise have been permitted by deuterium alone. We illustrate our results by applying them to massive gravitinos. If they weigh ~100 GeV, their primordial abundance should have been below about 10^{-13} of the total entropy. This would imply an upper limit on the reheating temperature of a few times 10^7 GeV, which could be a potential difficulty for some models of inflation. We discuss possible ways of evading this problem.