The Effective Field Theory of nonsingular cosmology

By Yong Cai, Y. Wan, Hai-Guang Li, Taotao Qiu, Yun-Song Piao. Journal of High Energy Physics, 2016

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In this paper, we explore the nonsingular cosmology within the framework of the Effective Field Theory (EFT) of cosmological perturbations. Due to the recently proved no-go theorem, any nonsingular cosmological models based on the cubic Galileon suffer from pathologies. We show how the EFT could help us clarify the origin of the no-go theorem, and offer us solutions to break the no-go. Particularly, we point out that the gradient instability can be removed by using some spatial derivative operators in EFT. Based on the EFT description, we obtain a realistic healthy nonsingular cosmological model, and show the perturbation spectrum can be consistent with the observations.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ecb79568ac5f107779c56f9e55b523e8836012f1

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Horndeski theory and beyond: a review (2019, background): “Finally, the no-go theorem can be circumvented in scalar-tensor theories beyond Horndeski [131, 141, 142, 143, 144, 138, 145].”