Gravitational wave constraints on the observable inflation
Gravitational wave constraints on the observable inflation
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DOI：
10.1088/1475-7516/2021/01/053
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发表时间：
2020-04
影响因子：
6.4
通讯作者：
Erwin H. Tanin;Tommi Tenkanen
中科院分区：
文献类型：
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作者：
Erwin H. Tanin;Tommi Tenkanen
在早期宇宙中产生的引力波（GW）对大爆炸核合成（BBN）期间的相对论自由度Neff的数量有贡献。通过使用对Neff的约束，我们提出了一个新的界限，即宇宙在今天最大可观测尺度的视界出口和暴胀结束之间可以膨胀多少。我们讨论了通货膨胀模型的影响，并展示了新的约束条件如何影响模型的选择。我们还讨论了当前和计划中的GW天文台（如LIGO和丽莎）的敏感性，并表明它们可能施加的约束总是比BBN约束不那么严格。
Gravitational waves (GW) produced in the early Universe contribute to the number of relativistic degrees of freedom, Neff, during Big Bang Nucleosynthesis (BBN) . By using the constraints on Neff, we present a new bound on how much the Universe could have expanded between horizon exit of the largest observable scales today and the end of inflation. We discuss the implications on inflationary models and show how the new constraints affect model selection. We also discuss the sensitivities of the current and planned GW observatories such as LIGO and LISA, and show that the constraints they could impose are always less stringent than the BBN bound.