Non-gaussian inflationary shapes in G3 theories beyond Horndeski
Non-gaussian inflationary shapes in G3 theories beyond Horndeski
复制标题
Horndeski 之外的 G3 理论中的非高斯暴胀形状
DOI:
10.1088/1475-7516/2014/10/037
复制
发表时间:
2014
影响因子:
6.4
通讯作者:
S. Renaux
中科院分区:
文献类型:
--
作者:
M. Fasiello;S. Renaux
We consider the possible signatures of a recently introduced class of healthy theories beyond Horndeski models on higher-order correlators of the inflationary curvature fluctuation. Despite the apparent large number and complexity of the cubic interactions, we show that the leading-order bispectrum generated by the Generalized Horndeski (also called G3) interactions can be reduced to a linear combination of two well known k-inflationary shapes. We conjecture that said behavior is not an accident of the cubic order but a consequence dictated by the requirements on the absence of Ostrogradski instability, the general covariance and the linear dispersion relation in these theories.
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通讯作者:
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DOI:
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DOI:
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发表时间:
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期刊:
影响因子:
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