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arXiv 2208.03045hep-thastro-ph.COgr-qc
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暗能量的$Λ_3$模型中的引力波相互作用

Gravitational wave interactions in $Λ_3$ models of dark energy

A. Emir Gumrukcuoglu, Kazuya Koyama

摘要:

我们认为,在强耦合尺度为$Λ_3$的暗能量模型中,两个标量引力子和一个张量引力子之间的立方级相互作用是普遍存在的。这些相互作用可能为引力波提供有效的衰变通道。它们也可以导致梯度不稳定性的标量扰动的存在下,大振幅引力波,例如那些检测到的LIGO/Virgo。与标量-张量理论中的模型相比,在一般的$Λ_3$模型中存在无限数量的高阶相互作用,这使得难以预测从立方阶相互作用推断的这些不稳定性的命运。

英文摘要:

We argue that cubic order interactions between two scalar gravitons and one tensor graviton are ubiquitous in models of dark energy where the strong coupling scale is $Λ_3$. These interactions can potentially provide efficient decay channels for gravitational waves. They can also lead to gradient instabilities of the scalar perturbations in the presence of large amplitude gravitational waves, e.g. those detected by LIGO/Virgo. In contrast with models in scalar-tensor theories, there is an infinite number of higher order interactions in generic $Λ_3$ models, which make it difficult to predict the fate of these instabilities inferred from cubic order interactions.

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