Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP01(2017)090
Keywords
Spacetime Singularities; Classical Theories of Gravity; Cosmology of Theories beyond the SM
Categories
Funding
- NSFC [11222546, 11575188, 11405069]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB23010100]
- Open Innovation Fund of Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University [QLPL2014P01]
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In this paper, we explore the nonsingular cosmology within the framework of the E ff ective Field Theory (EFT) of cosmological perturbations. Due to the recently proved no-go theorem, any nonsingular cosmological models based on the cubic Galileon su ff er from pathologies. We show how the EFT could help us clarify the origin of the no-go theorem, and o ff er 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.
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