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Variable speed of light cosmology, primordial fluctuations and gravitational waves
被引：0
作者：
J. W. Moffat
机构：
[1] Perimeter Institute for Theoretical Physics,Department of Physics and Astronomy
[2] University of Waterloo,undefined
来源：
The European Physical Journal C
|
2016年
/
76卷
关键词：
Gravitational Wave;
Spectral Index;
Inflationary Model;
Curvature Perturbation;
Flatness Problem;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A variable speed of light (VSL) cosmology is described in which the causal mechanism of generating primordial perturbations is achieved by varying the speed of light in a primordial epoch. This yields an alternative to inflation for explaining the formation of the cosmic microwave background (CMB) and the large scale structure (LSS) of the universe. The initial value horizon and flatness problems in cosmology are solved. The model predicts primordial scalar and tensor fluctuation spectral indices ns=0.96\documentclass[12pt]{minimal}
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\begin{document}$$n_s=0.96$$\end{document} and nt=-0.04\documentclass[12pt]{minimal}
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\begin{document}$$n_t=- 0.04$$\end{document}, respectively. We make use of the δN\documentclass[12pt]{minimal}
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\begin{document}$$\delta \mathcal{N}$$\end{document} formalism to identify signatures of primordial nonlinear fluctuations, and this allows the VSL model to be distinguished from inflationary models. In particular, we find that the parameter fNL=5\documentclass[12pt]{minimal}
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\begin{document}$$f_\mathrm{NL}=5$$\end{document} in the variable speed of light cosmology. The value of the parameter gNL\documentclass[12pt]{minimal}
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\begin{document}$$g_\mathrm{NL}$$\end{document} evolves during the primordial era and shows a running behavior.
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