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Similar

T. Qiu, J. Evslin, Y.-F. Cai, M. Li and X. Zhang, Bouncing Galileon Cosmologies , JCAP 10
Original
2011
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Z.-G. Liu, J. Zhang and Y.-S. Piao, A Galileon Design of Slow Expansion , Phys. Rev. D 84
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2011
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C. Deffayet, X. Gao, D. A. Steer and G. Zahariade, From k-essence to generalised Galileons , Phys. Rev. D 84
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Then

M. Libanov, S. Mironov and V. Rubakov, Generalized Galileons: instabilities of bouncing and Genesis cosmologies and modified Genesis , JCAP 08
Original
2016
Later among the works it cites.
T. Kobayashi, Generic instabilities of nonsingular cosmologies in Horndeski theory: A no-go theorem , Phys. Rev. D 94
Original
2016
Later among the works it cites.
A. Ijjas and P. J. Steinhardt, Classically stable nonsingular cosmological bounces , Phys. Rev. Lett. 117
Original
2016
Later among the works it cites.
R. Kolevatov and S. Mironov, Cosmological bounces and Lorentzian wormholes in Galileon theories with an extra scalar field , Phys. Rev. D 94
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2022

Perturbative unitarity and NEC violation in genesis cosmology

Cai, Yong, Xu, Ji, Zhao, Shuai et al.

Understand

Explorations of the violation of null energy condition (NEC) in cosmology could enrich our understanding of the very early universe and the related gravity theories.

Although a fully stable NEC violation can be realized in the ``beyond Horndeski'' theory, it remains an open question whether a violation of the NEC is allowed by some fundamental properties of UV-complete theories or the consistency requirements of effective field theory (EFT).
We investigate the tree-level perturbative unitarity for stable NEC violations in the contexts of both Galileon and ``beyond Horndeski'' genesis cosmology, in which the universe is asymptotically Minkowskian in the past.
We find that the constraints of perturbative unitarity imply that we may need some unknown new physics below the cut-off scale of the EFT other than that represented by the ``beyond Horndeski'' operators.