Cuscuton inflation

Nicola Bartolo

doi:10.1088/1475-7516/2022/05/008

2022-05-05

Nicola Bartolo *

Alexander Ganz

S. Matarrese

DOI：10.1088/1475-7516/2022/05/008

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摘要

En 中文

We study the impact of (generalized) cuscuton models on standard single scalar field inflation. Generalized cuscuton models are characterized by spatial covariant gravity where a scalar degree of freedom is made non dynamical, and there are just two tensor degrees of freedom. The presence of the non-dynamical scalar field does not spoil inflation but instead the modifications are, in general, slow-roll suppressed leading to almost scale invariant power spectra. However, the extra free parameters, which can be tuned relatively independently, lead to a larger parameter range for observable quantities, such as the tensor to-scalar ratio. For the (generalized) cuscuton model the non-Gaussianties of the curvature bispectrum are suppressed by the slow-roll parameters, and, therefore, outside the reach of current experiments. However, generalized cuscuton models can lead to a different shape for the bispectrum which might be constrained by future experiments.

Keyword:

inflation

modified gravity

期刊

Journal of Cosmology and Astroparticle Physics

IF:

5.9

论文数:

1.3W

被引数:

4.7W

机构

University of Padua

学者数:

5.1W

论文数: 4.3W

被引数: 57

istituto nazionale astrofisica (inaf)

学者数:

1.4W

论文数: 1.5W

被引数: 44

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